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  #1  
Old 05-19-2017, 08:21 AM
Clavius's Avatar
Clavius Clavius 目前離線
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Default Replaced sandbed, PO4 spike

My tank has been running very stable on Zeovit for years now. Test readings are always fine. PO4 0.01 or lower. And NO3 at 1. (Hanna ULR and Salifert.) And my corals generally look great and healthy.

But then I had to go and replace my live sand. The shallow sandbed has always given me problems. I went crazy from tuning my wavemakers to not blow any sand up. And when it did stay still, the lack of water movement would discolour it. So it had to go!

About two weeks ago I replaced the sand with ATI's fine, but heaviest gravel. I did this by siphoning off the sand off as clean as I could. The process took 3 evenings. Off course, I couldn't prevent dirt from escaping though. After that I placed the gravel that I had washed very carefully. I can now directly point my wavemakers at the gravel at full throttle without the gravel even flinching. Crud will blow out, but the gravel stays put. This also enabled my new gravelbed to be even thinner then the already shallow sandbed that I had.

I knew this would engage the new gravel in a sort of mini-startup. With diatoms and everything that goes with that. This is currently in full effect. There is a brown layer on the gravel when the photo-period progresses during the day.

What worries me is the rise in phosphates! It has now been stuck at 0.110 ever since, and doesn't seem to budge. My nitrates are low as always though, but PO4 has risen tenfold.

What should I do? Clean and stir the sand vigorously every day? Or just leave it?

Can I steer the PO4 a little with some lanthanum chloride? Or should I be more patient?

I am afraid that I removed to much biology and impaired my tanks capability of processing PO4 now.

Just some more specs:
- I use 1,2 liters of zeostones for my 500 liter tank.
- 5 drops zeobak every other day.
- 1ml zeostart3 every day.
- Balling for CA KH maintenance.
- 100% LED lights
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  #2  
Old 05-19-2017, 11:36 PM
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G.Alexander G.Alexander 目前離線
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Replacing the sand in a to short time range will have a big impact to the biology so a increase of nutrients can take place. Usually it is better to replace the sand slow over a couple of weeks in smaller steps. Anyways all you can do is being patient. I would not vacuum the fresh sand now at the moment, also BioMate might be helpful, 10 drops every other day for some time.

Additional make sure to adjust the skimmer to skim wet and clean it every day for some time to export as much as possible. Please also put some of the new sand (fresh) in some RO water for a couple of hours and check the PO4 level to see if the sand itself is the reason for the increase of PO4.

G.Alexander
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  #3  
Old 05-20-2017, 01:15 AM
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Clavius Clavius 目前離線
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Many thanks!

Verstuurd vanaf mijn E5823 met Tapatalk
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  #4  
Old 05-20-2017, 01:15 AM
tthorn0118 tthorn0118 目前離線
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Why are you dosing ZEObak every other day? Isn't supposed to be 2-3 times per week?
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  #5  
Old 07-11-2017, 05:30 AM
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Clavius Clavius 目前離線
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Quote:
Originally Posted by G.Alexander View Post
Replacing the sand in a to short time range will have a big impact to the biology so a increase of nutrients can take place. Usually it is better to replace the sand slow over a couple of weeks in smaller steps. Anyways all you can do is being patient. I would not vacuum the fresh sand now at the moment, also BioMate might be helpful, 10 drops every other day for some time.

Additional make sure to adjust the skimmer to skim wet and clean it every day for some time to export as much as possible. Please also put some of the new sand (fresh) in some RO water for a couple of hours and check the PO4 level to see if the sand itself is the reason for the increase of PO4.

G.Alexander
It is now more then a month later, but my PO4 still is out of control. If I do not act it rises to dangerous levels within days. (over 0,1!) So, every day I manually add enough phosphateex (lanthanum chloride based) to lower it to just below 0,03. The daily PO4 jo-jo has killed my Tridacna clam. I also use bio-mate, but it doesn't seem to really do anything.

Just to get the facts more clear. I only replaced the sandbed in sight. About 60% of the bottom of my tank still has the old shallow live sand-bed. It is under and behind the rocks. So there was no need to remove it.

I did collect some of my sand and soaked it in RO/DI water for a week. When I tested the water the PO4 was still zero. That means the PO4 is not leaching from the sand.

Anything else I can do to help my biology regain control of PO4? Or should I just continue to be patient?
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  #6  
Old 07-12-2017, 03:29 AM
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G.Alexander G.Alexander 目前離線
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That is really weird, do you still have a brown film on the sand or the rocks ? Would also be interesting to know how your corals have reacted to the changes, is there a difference to before ?

Any other changes you have done around the same time since you have replaced the sand ?

G.Alexander
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  #7  
Old 07-13-2017, 02:59 AM
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Clavius Clavius 目前離線
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The brown film comes and goes. When I lower the excess PO4 with Lanthanum Chloride it disappears for a few days. Then it comes back together with the higher PO4.

The only other change is the PO4 absorbent that I'm dosing. I never had to do that.

My corals are looking more beautiful then ever though! Very bright colours. No STN or RTN. Only my Tridacna Clam died. (I'm so sad.) I just discovered that filter feeders stress from Lanthanum Chloride and unstable PO4. Very poor choice of chemical; it was the only available at that time. This is exactly why I don't like chemical filtration and love the biological processes of Zeovit. I want to get it back on its tracks.

This is my current regime:
- I use 1,2 liters of zeostones for my 500 liter tank.
- 5 drops zeobak 3 times a week.
- 1ml zeostart3 every day.
- 10 drops bio mate every other day.
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  #8  
Old 07-14-2017, 04:59 AM
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G.Alexander G.Alexander 目前離線
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Weird, if you do not use a PO4 absorber do the corals tissue gets darker ?

G.Alexander
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  #9  
Old 07-20-2017, 04:08 AM
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Clavius Clavius 目前離線
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Quote:
Originally Posted by G.Alexander View Post
Weird, if you do not use a PO4 absorber do the corals tissue gets darker ?

G.Alexander
Sorry for the late reply. Work came in the way.

I think it stabilized just by doing nothing. I stopped the PO4 absorber to see if it will affect my corals. And I think that made the biology kick in again.

Or, better said, me panicking and lowering PO4 with absorber prevented the biology from doing its work.
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  #10  
Old 07-21-2017, 01:52 AM
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G.Alexander G.Alexander 目前離線
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Thank you for the update and glad to hear things are looking better now.

G.Alexander
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