Snooze wrote:

Do the plants get enough sunlight?
Try thinning out some of the plants, maybe you have more plants then the
fish can feed.

-S



They should be getting plenty of sun. And it is possible I don't have
enough fish yet. There are about 15 goldfish in 750 gallons, sized from
quite small to 10" or so. I stepped up the feeding to see if that would
change anything and now I have very fat goldfish but the plants are the
same.

Mark B.