I like the Matamata idea with Cichla. I have a Mata and Dat tank that is too small for cichla. I have 5 Red Hook/thin barred SDs, I full grown Featherfin, full grown 4 lined cat, two 10-11" Indos, one 6" Indo, one 5" NTT, one 3" NTT, one 3" NGT, one 5.5" AT, and one 8-9" Delhezi. The Mata is about 6" shell length. I would add cichla and maybe a pima cat if I had the 220! The combo of awesome cichla and the wacky Mata would turn heads no doubt!!