2, don't put too much, too many snails will compete with the fish for oxygen, so that oxygen is insufficient. Oncomelania hupensis can achieve a certain cleaning effect, but because Oncomelania hupensis spits mucus, the water quality will become dirty and affect vision.
3. Stonesnails that eat feces can really decompose the food that goldfish have not completely digested again. Goldfish belong to CYPRINIDAE. Starch indigestion. Stone snails mainly eat brown algae. Also eat organic potato chips and fish. But if the dissolved oxygen is less, the stone snail climbs to the waterline to breathe. Snails are only effective in well-lit fish tanks with aquatic plants. To raise snails well, there should be enough calcium in the water. Precipitated calcium can also be used.