Hmm. This is an interesting thread. I guess I'm a minimalist. I test my water twice a week and I usually only top off for evaporation. Once a month I'll vacuum substrate, replace whatever water I lose doing that.
It really depends on an individual tank, how stocked it is, what kind of fish...
I wouldn't keep more than a pair with maybe a small pleco or bottom feeder. Not saying anything else wouldn't work, just I wouldn't want to try it.
I kept my pair of mating angels in a 40 and that was just enough. If anything else besides my pleco had been in there I'm sure they would have...
Hi. Sorry your having some struggles.
I think you have a fungal issue, with white spot and fins look kinda melted, possibly fin rot. I would consider treating that in a separate hospital tank setup.
I've found it difficult and taking longer to cycle tanks with pH under 7. So maybe your in the...