IMO, Cycle is worse than useless as it doesn't work, yet might lead
someone to think they're safe (until they find the floaters).
I agree. Leaving aside the argument about whether or not Cycle contains the
correct bacteria, there's little or no live bacteria at all in the average
bottle of Cycle.
And yet, some people swear it works, just as some people swear Bio-Spira works.
(Does the "placebo effect" apply to fishtanks?) That's why I'm skeptical of