Plants seem to be hit or miss, many think though that its a myth you cant keep a nice planted goldfish tank. Some of the nicest Madagascar Lace I have ever seen was in a metal halide lit co2 injected goldfish tank. Right now I have some shubunkins and comets in a 40 - long (48") low tech planted tank with several swordplants (red rubin, amazon) as well as lots of java fern and anubias. They havent touched any of it. They do often pick at the huge floating masses of baby tears, but they could eat all of that for all I care, but they never seem to eat any more than the plant grows. In a low tech tank make sure to pick tough plants that the goldies can eat well, like anubias, java fern, large swords, etc., or maybe fast growers that replenish themselves quick. On high tech tank, the growth should be high enough that you dont have to be as careful, but I suppose that will depend on the individual personalities of your fish. As for me, I have a 150G tall waiting to setup for my goldies, which I will also include a group of dojo loaches as well (atleast 6). I am going to try the high tek tank out, with good lighting and co2 and see what happens.
