My tank is a 10 gallon divided tank.
I've had it set up for three months. When I checked the ammonia yesterday, I was stunned: it was yellow. I've never checked it before without it being green, even after full water changes. The PH, general hardness, KO3, etc, were perfect. Otherwise, temperature is at a constant 78 degrees, has an aquarium light eight hours a day, lots of places to hide, etc.
However, algae was beginning to build up all over my tank. I'd clean the tank and it'd be back the next day. So, I went out and bought a plecco and a dalmatian Molly. I also bought a Comet Goldish because I felt bad it was going to get eaten. (It has its separate 2.5 gallon tank with a flifter, and I'm totally looking forward into investing into a 50 gallon tank three years up the road; the lady told me they don't live more than a year.)
Anyway, is my tank overstocked? There's not much I can do, really, other than increase water changes, and monitor the ammonia/PH levels.
One side: Betta fish, Plecco (large), African dwarf frog. There's less on this side because it's also the side with the fliter.
Other other side: Betta fish, Molly, two neon tetra, small pladdy fish.
To be completely honest, the dwarf frog tends to slip between the divider and goes side to side. But I intend
for him to be on the first side.