Hi Weilong,
Me also have same problem but I am leaving them alone right now coz mine only looking 4 algae. In 3 days I counted more than 20 snails. Only when there r too many will I add 1 puffer fish. My tank only 3 feet. 4 ur case 1 puffer is enough or else the puffer will turn on the other fishes in ur tank.
B.F.G








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