I have a 3.5-4 gallon tank I forget, and lately I noticed on the sides of the tank he had yellow/greeny round spots. Algae? I dunno anywho I don't know much about snails but would one clean up the algae on the sides of the tank I dunno if they like eating all kinds of algae or what. Also would my fish try and kill the li'l guy or u think he'de just think he was an odd rock roaming around? Also what kinda food do snails eat? would my betta just ignore the snail food?