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- Sep 20, 2018
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For some tanks, 0.25 PO4 might cause some issues (eg acro tank). For what you’re doing, I wouldn’t sweat it too much if the coral looks good and algae isn’t bad.Corals look good. No deaths since setting up this year, but growth is rather limited to be honest.
Algae wise is not so much. Just on the back glass and I feel like it’s increasing, but it isn’t on the rocks.
I don’t have a refugium, just a sump with skimmer, filter socks, uv, and dosing pumps.
I would be surprised if slow growth in your tank was attributable to PO4. Not at that level. Softies in particular benefit greatly from feeding.
It’s probably good to nudge the PO4 down over time, but I wouldn’t mess around trying to make a big drop quickly.

