I was assured by the sales girl that my two brand new yellow tanganyikan cichlids would be fine in a 10 gallon tank. But for the past hour or so I have been reading online different articles and information on cichilds. Apparently not all cichilds are good for 10 gallons. And i keep reading about some cichilds that need to have sand in their tank instead of gravel and are "shelldwellers". Now im freaking out and confused because apparently there are all different types of Tanganyikan Cichlids out there and all this girl told me were they were Tanganyikan Cichlids. So im not sure what exactly I have. How can i tell? I have also heard these fish need rocks in the tank! Please help. I want my fish to be happy and healthy and i thought they were doing allright and now with all this new information i read im not sure! How can i tell if they are shelldwellers? And do my fish need sand or are they ok in the gravel i have in there? Do they need rocks???? Thanks for any help anyone might have