Hello, my first post, been lurking for a while and love this site! My question-

I have a 95 litre (about 25 gal) tank with heater, filter, fake plants and light. In it is 6 Shubunkins, 5 Black Skirt Tetras, 1 female fighter and a mystery (apple?) snail. I don't have any issues with ammonia or pH but I was wondering if you would consider this overstocked? I know the Shubunks will grow larger but they grow pretty slow right? They're about 6 cm at the moment and 4 of the tetras are babies.

What do you think?

I would class that as overstocked. Shubunkins can grow to 25cm or more in a year if given ample room and feed. They will be growing slow due to your tank size.

Also, just for your info :) Shubunkins are a cold water fish and the rest you have in there are tropicals. Different water needs :)