hi, i have a panda corydora in a 2 gal right now(i know it needs a bigger tank and be in a school of at LEAST 4, but when i got it i was a stupid begginer who didn't do any reaserch), anyway i am getting a 10 gallon sometime soon and i want to put my corydora in it along with 3 more, but i was wondering... would there be space for more fish? for example if i wanted to add a male betta OR a school of ember tetras? or any other fish(please suggest). thanks to all!