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Yeah i heared it will spread like crazy too!! I was told Sally lite foot crabs but i just thought i would ask and see if anyone had something that just loved to eat it
I got some on my LR, it never spread before I removed it (and that was after the emerald ignored it for a month). But as long as you do it carefuly (don't pop the bubble unless you siphon it all out), you should be set.
I believe the emerald only eats the valonia bubble algae when it first starts to grow. Therefore, you have to remove the larger bubbles and then as new ones develop, the emeralds can get them.