Corals not growing, am I missing anything?

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Hi all, new member here.

My tank has been running for perhaps a year now. Its a waterbox cube 20 (75l). AI Prime on 75% across most channels (except green and reds).

Amm - 0
Nitrite - 0
Nitrate - 0
Phos - 0
Temp - 27.5
Salinity - 33
Kh - 8
Ph -8.4
Cal - 450
Mag - 1350
Weekly 25lt water change with nsw

I have a small gyre pump which runs very low and a small hob Skimmer, I have a bag of purigen in the filter and a bag of carbon. stocking wise there's 4 clowns (will be moving a pair on once a pair is established), a few snails, and crabs, 1 skunk and 2 peppermint shrimp. I started everything from scratch with dry rock and sand etc

My issue is that corals just don't thrive in my tank, even "Hardy beginner corals". I have mushrooms, star polyps and Duncans and they're just not growing and other things I've tried eventually wither away.

What am I missing??

Thanks

Eady

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Reply #1

I'd be looking into the nitrate... you want a little nitrate as corals do like slightly dirty water.

Raise it to 3-5ppm

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Lplum

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Reply #2

Yea I was thinking perhaps down the same route, I recently tried to increase nitrates by increasing feeding but I saw no change, possibly because I have the purigen in there? Is there another way to increase nitrates?

ajm83

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Reply #3

Hi @Lplum Welcome to ReefBase

Yep,  and I would add phosphate to what Eady says too.  0.03-0.06 would be a decent target for that.

You can also try feeding the duncan with ReefRoids or frozen foods.  The mushrooms may also take it.  Don't think the GSP will but no harm in trying.
In any case adding extra food will help raise the nitrate and phosphate a little anyway.
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TheJag77

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Reply #4

What tests do you use? I would expect nitrates and phosphate to be above zero as others already said.
Would you not want salinity at 35?


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ajm83

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Reply #5

Would you not want salinity at 35?

ideally but 33ppt is about 1.025 @ 25c so I don't think it's an issue, stand to be corrected though!
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Lplum

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Reply #6

Cheers for the input guys, appreciate it.

I use api for the basics and salifert for kh, calc, mag and Phos

As far sal salinity goes, I use nsw and have some salt/ro to adjust if necessary but haven't ever needed to adjust that, just try to keep things stable.

Would the purigen be stopping any nitrate building up?

ajm83

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Reply #7

Cheers for the input guys, appreciate it.

I use api for the basics and salifert for kh, calc, mag and Phos

As far sal salinity goes, I use nsw and have some salt/ro to adjust if necessary but haven't ever needed to adjust that, just try to keep things stable.

Would the purigen be stopping any nitrate building up?

Gut feel is that it won't make much difference to nitrate and phosphate,  but no harm in removing it as a test. 
When I ran Purigen on my nano I still had problems with high nitrate (lovely clear water though!)
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mightyhatter

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Reply #8

Would agree with the other posters - raise your nitrates and phos a bit and it might help. You could reomove the purigen, turn off the skimmer for a bit, feed more or add more livestock. Any could give a boost

Might also be worth lowering water changes a bit. 10% a week is fairly standard. Changing a third will also knock back your nutrient levels

Lplum

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Reply #9

Thanks guys, I'll remove the purigen and up the feeding and see if things can get a little dirtier!

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