LFS advice on algea

[Spyd]

The problem is you are comparing plants to corals... I have not heard of corals extracting ammonia in a clean system unless they are dying off.

Why not test for ammonia and see if you have anything there. It is possible your medicating killed off a lot of your bacteria and will just take time to re-colonize.

I run a ULNS and have not seen any signs of GHA. Cyano is definitely an issue with carbon dosing. Stirring up your sandbed will help that. Also, blowing off your rocks once a week is good housekeeping to prevent any food, etc from decaying and producing the PO4 needed for the GHA. I use MB7 along with my bio-pellets to keep cyano in check. Does it work? I think so... But, when add more pellets to the system to replaced the ones used up, I find I have to be very careful. Too many pellets and I will see signs of cyano. Carbon dosing can be tricky to not over dose it.