lagoon? hmm.. are you playing VV1 or 2?

The algae eating fish come from the body of water that is on the right side of your screen, just above the dam you build, which is just above the area that the mosaic floor is uncovered at that you thought was the pond that the fish came from.

im playing vv2 i just call the the pond a lagoon because in vv2 there are two ponds.