You make no sense whatsoever. First you are telling myself and everyone else that too many WC's are bad b/c you are killing the bb, which is not true. Then you turn around an tell us you sometimes don't add prime to your water which WILL kill bb in your filter and substrate etc... Maybe to you it's no big deal, but you run the risk of sending your filtration through a "mini cycle" which is not good for your fish. It appears you don't care either way though. Whatever works for you buddy. I for one shall never do a WC without a prime. I personally won't run that risk and think that's asinine, but two each their own.
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You been of MFK for little over two months push on
Sent from your wifes car!