Alge issue

[gobytron]

Cyano could be a factor of it just being a new tank.

You definitely have some phosphate in there.

You probably have the algae consuming it before it can really get into the water column and show up in testing.

Look into running some GFO or some chemipure...

That might help.

Sea Hares are, IME, the best HA eater around...especially for the stuff on the rocks that can be hard to get to and remove from the roots.

A 7 gallon tank is a challenge for anyone to keep long term.