I would say no it will not eat planaria i have both type those colourful one (which doesn't eat anything except snatching the food from my shrimp) And those wild brown zebra apple snails which will bulldozer over whatever plants u have in your tank and u might wake up to a brighter tank cause light can pass thru.They do however does eat hydra only those hydra that all sitting on the plants not the colourful one but the wild zebra as for the those hydra sitting on the glass hmm nothing able to remove them except maybe betta etc.
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