Thats quite a few gallons for an indoor pond though
Are you planning on getting any more species of fish or just getting different types of danios? If you havn't got them already, i think pearl danios are awesome little fish and very beautiful looking, when in good health their metallic pink realy comes out
it's just a 2x4 timber frame and then we laid some old firestone rubber liner down double thickness, cut the decking to fit round the top filled it a bit then screwed it down!
Simple!
we just used bricks to arrange the water walls and put red gravel in the bottom. It's just run by a 700lph pump for the water fall.