Ok my friend just left Canada and is on his way to met some other friends in New Zeland.So he pretty much gave me his tank witch is 77 gallons 48x24x24.Now he has African Cichlids in it but i'm not really the fish expert.Ihave 5 blue fish with the 1 orange female.(sorry but i don't know the names).I put the female in my 10 gallon for now as she was getting beat up pretty bad by the 5 males.I also have 1 electric blue and a yellow lab(i think).So my friend left it in pretty bad shape so i cleaned it up and now it looks ok.I've been looking around the forums on taking care and stuff but most of it i don't understand.To start of what is KH?What should I have inside my filter?It's a fluval 404 by the way.Please help me start this great adventure.Oh yes i've had fish in the past but only tetras and goldfish.