I have 7 rainbow fish, 10 neons, 4 bumblebee platys, 1 gold dust Molly, 3 plecos, 1 angelfish, 1 betta, 2 nerite snails, 5 panda corys, 1 episto, and a powder blue gourami. My tank is HEAVILY planted. I would say my tank is at capacity, given they’re all going to grow- even so, IF I feel the tank seems to be shrinking- THAT means I get to buy the 125 I’ve always wanted!but I doubt it- if I exceed what I’ve got now, I’d definitely be pushing my carrying capacity.
I have them in a 40-breeder, two HOB filters plus a box filter with a nice air stone. I’m filtering my tank more than 11 times in 1 hour. Personally, I think my population is right where it needs to be. I’m going to throw it out there and say for your capacity- you’re underpopulated- meaning I think you can have much more. I’m not opposed to water changes- so it doesn’t bother me. Water change day is when the plants in the house get watered. Enjoy!