Alright so I've been thinking of what to do with my old 50g. A grow-out was feasible, but boring. Piranhas were also considered, but they too, are boring. I think I'm going to keep African Cichlids. My question is, what special measures must I take to keep the water in check? I plan on using play sand, so crushed coral to raise the pH is out of the question. I'm also not keen on using buffers to alter parameters, so they are out as well. I've read that Lace rock raises pH nicely, so is that something I should look into? Filtration is via an Eheim 2217, btw.