I planned on setting up a 20 gallon community & eventually try to add my Betta fish. I'm new at this hobby & didn't realise my city's ph was in the higher side, at around 8.2. I already have a school of glowlight tetras & they seem to be doing fine.Id like to add a school of corys. Any suggestions on what fish or type of fish would be fine for that level of ph ? I want them to thrive, not survive!