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I agree Joe0813, waste of money.
I thought these things would keep the tank clean.....NOT....
I think the crabs said forget the algae....I see escargot!
I have found that creating an environment which algae does not like much (low nutrients, balanced photoperiod) and me, pulling by hand was better, cheaper and faster than any crew I ever had.
The added bonus is I had 31 snails 17 months ago and today....still 31.....
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