I'm mainly concerned about turbo snails. I'd like to have some to help clean the algae. Like I said on my profile, I don't yet have a tank. Or any fish. The Petco compatibility chart puts invertebrates and eels as bitter enemies, but I conferred with a friend who thinks that since the snails have shells, the eel won't eat them. But, I'd rather not waste the money on the snails if the eel will just devour them. Also, if you know of any other nice Saltwater fish that would be beneficial to the tank environment (I'm looking to get one larger than 40 gallons), or just some that look nice that won't get eaten, please let me know. I would really appreciate the help. Thanks.