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Fish Crazy
So i bought a used tank from a pet store down the street that was going out of business. It is working very well and was an excellent value. The only thing is, after i filled it with water i started noticing curly shelled snail things all over, atleast ten of them. What are they? Should i be concerned or should i be happy with them? the tank was empty of water for like a week so i dont know how they survived