Sorry if this is a dumb question but I'm completely new owning such a large tank.
I have a 55g (stock filter that came with it, says compatible up to 75g)
ONE Oscar about 7in.
ONE Plecko about 3in
3 tiny feeder fish
No plants
Readings as of 10/21 -
Ph 7.8
Ni 0.0
Nh 0.0
Am 1.0
Water Temp...