I am new to this and have been trying my hardest to do what is best for my fish. I currently have a 28L tank that houses 1x platy. I had visited the pet store and asked for advice on fish, tanks, etc. and was told that a platy would be suitable for me in the tank size that i have. now after reading on here i dont believe i was given the right information. I want to make sure that he is happy, i would also like to add more platys so he isnt alone in there. Is this possible for the tank size i have ? How can i make sure he is happy ?