pros:
1)aerate substrate for you
True... loosen the substrate for better root growth
2) eat algae maybe the irritating spot algae on the tank wall
not really, its more unsightly if they r all over the tank wall instead of algae
3) interesting to see
cons:
1) may eat plants
nope, only dead leaves
2) overpopulate
yes
3) diff to irradicate
remove them manually
4) may cuz plants to unearth
nope.. too small to do anything
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