Another thing. I'm going to be doing a 75g with 6 Geophagus Tapajos 'Red Head' and a B.Tigrinum. The substrate will be sand of some sort. Filtration will come by way of a Fluval FX5. My only concern is the sand being stirring and sucked up by the intake tube? I've never kept a sand bottom tank, but it seems the way to go with Earth Eaters.