hey guys , i have a 30 gallon tank , all my water parameters are good nitrates a little high though (30 ppm) but i havent worried about it much my tank has been set up from three months now , i bought two clown fish they had fin rot after a few days of addition then they died after that a couple of days past and i bought another clown fish its been doing good since then i bought a butterfly fish it had ICH three days after it was added to the tank then died one day after that i went head and bought two three striped damsels i just found out they have a very bad case of ICH and they're probably not gonna make it through the night i dot know what im doing wrong i do frequent 25% water changes and feed my fish frequently and keep the water parameters ideal however i dont quarantine my fish before adding them as i dont have a quarantine tank yet , any ideas ? im actually a little depressed because of all that i love that hobby and have spent nearly all my savings in it but it doesnt seem to be working out i would appreciate any help