Mystery snail near betta surrounded by 2.5 gallon?

Nah, thats too much bio-load. Mystery snails are filthy snail speaking
How do i breed feeder goldfish?
to messy pets in one little container, not such a good idea but if you upgrade your reservoir to about a 5 gallon or more it would probably work.
Are jungle fungus clear tablets supposed to...
Answers:    That should be fine as long as you keep up with your tank continuation by doing regular water changes. bettas are not messy fish. Plecos, goldfish, and cichlids those are fish that are messy and make deeply of waste. Bettas are pretty clean.
What size cistern works?
bad idea! mystery snails dont own sex, but they do it them selves,so if you have just 1 soon it will turn into a ton!
Is it okay to turn the desk light bad surrounded by a fish container at darkness?   What brand of reservoir should I carry my betta?   Would it be possible to crossbreed a smallmouth bass near a jack dempsey african cichlid fish?   Freshwater cistern w/ sand?