So the other day I was feeding my fishes in my 45 when lo- and be hold on the side of the tank is a snail. I have never in my life bought a snail, never had one in that tank before and here it is, in my tank. Could someone please explain this mystery to me and also, are snails good or bad to have in a tank. Don't they carry a lot of diseases? Should I let it live on in peace or evict it?
