Ok everyone I'm newer to the hobby and I overcrowded my tank. It's a 10 gallon community tank with 20 gallons of filtration. I have 1 rainbowfish, 1 albino cory catfish, 4 glofish tetra, and 6 neon tetra. All fish look healthy and are active. My question is how to keep it that way while overcrowded? I'm unable to move any fish to larger tank at this time and have grown attached to them so I don't want to give any away. Would doing 25 percent water change every other day keep ammonia at bay?

Doesn't sound overcrowded, but others will disagree. That's roughly 1 fish per gallon of water not allowing for sand, decor and such. I have a way more crowding condition, no problems (now) and the secret seems to be a good cycling of ammonia, nitrites and nitrates. 0 on all 3 levels. Do a 6 gal. water change daily (2 buckets) and have high microbe content. Done via filter, lava rock and related additives, heavily aerated also. Air stone and 2 divers.