I have a 220g standard tank and I've always wanted a FW ray to put in it. I recently moved and just set it back up. I used a very fine silica sand as a substrate for 2/3 of the bottom with a fine gravel in the remaining 1/3. First, I realize that it will be some time before I can even think about adding a ray, but I currently have a managuense, FH, Johanna pike, and a carpinte Texas (all juveniles, the largest being the pike @ 6"). I've read that rays do not do well with aggressive cichlids. Am I going to have a difficult time adding a ray or will a ray be able to bury itself in the sand for defense?

