So I bought some Columbian Ramshorn snails (Marisa Cornuarietis, not the normal ramshorn). They are beautiful but can't go into my main tank because they are notorious plant-eaters. I have them in my 5g which is a quarantine tank. They don't seem to be eating the food I offer them, like fresh veggies and algae wafers. I think they are living off the biofilm. Does anyone keep these? What do you feed yours?