well i am looking in to building a 5x4x2 indoor pond stocking will be 1 giraffe catfish 1 arrowana and hopefully a perruno cat here are the questions i was thinking 4 150 watt +1 300 watt heaters to heat it and for the filteration i was going to use a 21x14x14 box with a layer of filter floss then full of pot scrubbers with a 6000lph pump tyhen added on when the fish grow a 16x11x12 box with the same layout and a 4000lph pump would this be enough heaters and filters