Very interesting Kypros, my new tank was a saltwater tank originally and the guy has four 1.5" holes drilled at the bottom (two at each end) for the high recirculating flow you are referring to; this is in addition to two corner overflows for the wet/dry; I was going to just plug these for my fw planted tank layout but now I will consider utilizing them for a continuous recirculation pump with maybe a couple inline heater modules from Livegard; Thanks for the idea! Jeff. _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member