Hi. I currently have 3 Corys in a 30g, but understand they are more comfortable in larger groups so I'd like to add 2 more. Question is... if I only buy 2 more and put them in a 10 gallon quarantine tank for a couple of weeks, does it stress them out to be in too small of a school for that time? i.e. is it ok to add a small amount of fish if they are not isolated for too long? I'll have the same issue if I want to add more Cardinal Tetras... i.e would it be ok to add 3-4 more and keep them in isolation tank for 2-3 weeks. Thanks!