I have a 29 gallon hexagon flat back. Love this tank. I only have1 filter on this tank but it has 6 glowfish, (1 of ea color) and 4 glow danios. I have 2 bubble wand LED lights so the fish really light up. As for a community in my 40 gallon tank I have 5 bloodfin tetras, 5 zebra danios, 2 red...