Hi Everyone, I have a 500 litre tank with a 160 litre sump, the tank stands on a 3.5 ton brick and concrete base, inside the house, yes, my friend and I went alittle overboard with the brickwork, in the tank I have 2 reds and 1 albino red, the sump has all the media, heaters, sterilizer, pump and lots of water plants, the water is perfect, ph, nitrates, nitrites an all, I will recomend a sump any day, my wife has fallen in love the Snowy, bubbles, and shark, snowy and shark are 30 cm +, and bubbles, the female is smaller. I will upload photos soon.