Hello I have a 10 gallon tank with two goldfish ( I plan on upgrading the tank size once they grow bigger they are still small atm). And at the moment two black racer nerite snails. I was thinking of adding some more snails but I don't know how many is too many, I heard maybe the mystery snails require less food so they would be better? Any experience/suggestions would be nice. I feed my goldfish spinach and other veggies occasionally which may help with food suplementation.