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Look at the movement and shape. If its a pod it will basically look like a flea and run around. Its hard to explain the shape of a flatworm but a quick google search will give you that. Then instead of quickly running around it will slowly slither like a snail/slug. Some of those in the pic do have a resemblance of a possible flattworm
Edit: If it does come out to be a flatworm dont panic either not all flatworms eat coral. Most actually are basically harmless but will reproduce rapidly. Reason I add this is I have seen people panic from a flatworm that was pretty harmless and dose the tank with flatworm exit and nuke the tank. Harmless flatworms can be managed with good husbandry and maybe something that eats them. 6 lines I think work on flatworms but 6 lines can create there own issues.

