I currently live in Baumholder, Germany where my husband is stationed. He just bought me my 55 gallon tank I have always wanted. So far it;s just filled with water. I need a good filter in there, I am clueless there. Someone mentioned a Eheim filter. I also have some ideas for my freshwater fish. I want this to be a colorful tank, with different Ideas that will "aww" my guest. I want to lay dark rock, probably blue, with black marbles. Some fish are as follows autonocara eureka, autonocara red rubin, gescheckter fire fish, blue neon, marmalade cat,blue sambia, protomelas boazulu. I am not sure which fish can go with what, and how many will fit in my tank! Any suggestions will help!