I'm leaning towards the Rena Smartfilter. Its for a 20g high tank. Both have pothos. 1 is planted community, the other breeding convicts. I have sand in my tanks, every single ac I have had with cichlids and sand, with the intake as short as possible the impellor goes bad within days. I have prefilter sponges on all filters. So that doesn't help. I usually just end up throwing the AC's out because the impellors suck. What do you think I should get?