GHA and nitrate problem HELP?!?!

[JCortez3]

I have a 32g biocube and in the last month I had a few patches of GHA and my corals were looking kinda dull and not extending all the way and 2 weeks ago I did a 3 day blackout and treated with peroxide and now most of the GHA is gone (2 or 3 patches very very thin and small) and now I'm trying to get nitrate readings and I'm showing nothing. So I started dosing potassium nitrate with RODI water (4 tblsp. For 1000ml) and I dosed 10ml at a time up to 200ml and tested immediately after and I'm still not showing any nitrates. Also have a big bioload. After dosing the nitrates my corals seemed to have kind of get some color back and seem happier but not quite all the way. Any help is appreciated.

 

[Kfactor]

I had the same problems with zero no3 I was dosing it and dosing it could never get it up . I got a new test kit the Red Sea no3 and just tested and I’m reading 50ppm lol not to sure at this point what to do

 

[JCortez3]

That was my other worry after dosing and checking with my API kit after seeing zero I immediately ordered a salifert test kit which should be here Friday