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Old 05-31-2015, 03:26 PM   #11
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Redoing my 20 gallon

How old is the system? GHA is a very common problem. Healthy corals will not allow it to grow on them, but everything else can get pretty messed up. Any creature you place in the aquarium to eat it, just recycles the organics that cause the algae. They can help, but aren't a cure. Removing the organic matter thru filtration and/or water exchanges is your best long term bet.

I use a ATS for over 20 years that uses algae to fight algae. Overkill for a small system though.


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Old 05-31-2015, 03:35 PM   #12
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Couldn't the PO4 be leaching from the LR if it was exposed to high levels over time?
Food for thought:
Chemistry And The Aquarium: Phosphorus: Algae's Best Friend — Advanced Aquarist | Aquarist Magazine and Blog
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Old 05-31-2015, 03:46 PM   #13
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I don't remember seeing a phosphate number. What is your tank reading? If you have SPS, they hate high levels of phosphates, I'd think you would be having issues with them already.
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Old 05-31-2015, 04:02 PM   #14
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The tank is almost 3 years old now. I'm getting a .03 on my Hanna checker for phosphates when I tested the other day. I'll test again when I get home. My sps all have good color and moderate growth. I'm assuming the algae is taking it up as fast as it is leaching out though


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Old 05-31-2015, 04:13 PM   #15
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let me ask this are you running charcoal , I stopped running it in mine and all algae stopped almost instantly and I never seen such a sparkling tank before , who would have thought charcoal could cause such havoc , the charcoal also kept phosphates up
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Old 05-31-2015, 04:20 PM   #16
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Redoing my 20 gallon

Some charcoal is loaded with phosphates. Check the packaging. A faulty or old RO/DI system can also add unwanted organics.

The live rock will leach P04 if there is die off, but a three year old tank, that should be over with. It's excess organic material, not just P04 that is driving the GHA. Your right, your readings are low because the algae binds the P04 before it can show on a test kit. A filter medium like GFO, will compete with the algae and eventually win as it also is an effective binding agent for phosphates. Everything happens suddenly in a small system, so work slowly and make any changes gradually.


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Old 05-31-2015, 04:23 PM   #17
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Nope no carbon but the rodi is due for a change. I'll look into getting my hands on some GFO. Looks like I'll keep up the 2x weekly water changes and just pull it out.


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Old 05-31-2015, 04:24 PM   #18
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Check the RO/DI water in newly mixed salt and see what it's P04 reading is.


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Old 05-31-2015, 05:33 PM   #19
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Its not the phosphates causing you your trouble.
Whats your TDS from your RO/DI reading?
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