I have a 20Long "Asian Swamp" biotope tank inhabited by my pair of dwarf flame gourami and their spawn (a half-dozen or so nickel-quarter sized fish). The tank looks nice, with tannin-stained driftwood and several live plants.... Unfortunately, I never see the fish. Every couple of weeks I move a net around the tank just to see if the fish are still alive.
When I feed the tank I don't even see them, but if I leave the room and come back the food is gone. I do see them when they spawn though, which is a 2-3 day marathon every month or two.
The glass in the tank is tinted with a hard brown algae that I usually ignore, thinking that if it gets dark enough, maybe the fish will come out more.
Lighting is a single-tube flourescent fixture.
Would a small school of rasboras or a trio of loaches help?
Is there any fish that would leave the eggs alone? If not, I can remove the eggs when they're laid.
Pictures of the tank are attached, but they're quite poor.