About 4-5 years ago we got a 55 gallon tank full of cichlids off of craigslist since then all but 4 are left and i want to restock it and do it right this time since i had no real knowledge of these fish. the substrate in it is gravel. I have a few questions like should i put i wavemaker in it. ( a few people suggested one for circulation) and should i change the gravel to an araginite sand and should i overstock it to bring aggression down