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Hi, could anyone tel me what sort of snails a freshwater green black spotted puffer fish can eat? i feed him on frozen blood worms which he loves, and also occasionaly a cooked scrimp. Petsmart say they cant get any snails for a while, dont know why. Also, i have Penguin power filter with bio wheel, i know you dont do anything to the bio wheel as regards cleaning, but what about the filter? it gets really gunky and i have , at water changes, swished it around the old tank water in a bucket, but its still gross, so is it ok to change it? after i rinse the new cartidge in old tank water? will this mess uop the good bacteria? or wont it matter cos of the good bacteria on the bio wheel i am a little confused about that, thats so much for any advice.