I have a 20g not long tank (couldn't fit 20g long on my desk), currently fit with 2 neon tetras, and 3 freshwater clams. Today,(around 5:30-6) I'm going to the store with my aunt to pick 3 male guppies (don't need 3,000,000 guppies swimming around!). Later I will buy 9 glowlight tetras, 2 Ottos, and possibly some Java moss. Will there be any conflicts upon putting the fish in? I tested the water on saturday and it had 0-1 Nitrite, 0-1 Ammonia, about 5 Nitrate, and somewhere around 4.5 PH. I have a cover, a heater, a light, and one of the thingies that draw water from the tank and dumped it back in, oxygenating the water. I've had the fish since around November, along with the clams. They came from my aunt's friends fishtank, and have lasted around a year in her tank without casualties. Thanks! :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap: