I have 4 german rams in a 20G community tank see sig. The german rams are almost identical to the blue rams but they are said to be a little hardier. I really like these fish. They usually hang out in the lower levels of the tank and stay near (not inside) their caves. They are said to be very sensitive to nitrite levels. Make sure your tank is completely cycled before you get them. I read that they don't like tankmates that will bother them or compete for their territories. The ones in my tank seem to be doing well. I tried not to add any other lower level fish. One word of caution, they are really messy eaters. I don't give mine flakes any more because half of what they eat comes back out like a fine powder. Now I feed my tank only micro pellets. It does help cut down the mess.