Hello all, I recently saw a little clear plastic cup with marimo balls on sale (2 balls each about 1cm diameter), and having recently read about these cool little guys, I bought them. The cup I bought them in is sealed with a lid that can be removed. Now, according to the instructions I received with the marimo, it says I can just leave the balls as-is in the cup and change the water once every couple of weeks, and the marimo will grow (being low-light, they don't need more than indirect light). Having kept fish for a number of years, but being a newbie to plants, I'm a bit worried about leaving the marimo in a sealed container with no air exchange and limited water quantity. Should I move the marimo to a "real" tank, or will they do fine in a sealed plastic cup? For now I'm not putting them in with my goldfish or my medaka because I heard the fish will eat the marimo. Opinions? I'm pretty sure goldfish would devour the balls, but how about medaka?
Keep in mind that marimo balls are not really an aquatic plant, but rather a special form of cladophora algae that we, in this hobby, try so hard to destroy. I am not sure if it will eat your marimo, but your marimo is probably safe in that cup.
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