I am not sure what is causing this. I was wondering If I should scrub it off ?
This is 1 day after a 50% water change .
Specs
55 Gal
150 W
PH 6.6
KH 5.0
c02 38ppm
GH 7
Phos - 3ppm
Nitrate-10ppm
Reset with 1/2tsp NO3 1/3tsp K & Phosphate - 0dose & dechlor
Sat,Mon,Wed Macro
Sun,Tue,Thur Micro