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It should not but you never know sometimes. What kind of substrate do you have? If it`s sand you really dont need a cleaner. A good clean up crew will do the job. JMO
if i remove a lot of the CC can i put sand on top of it because my tank is lightly stocked at the moment, so it would be easier to change now than later.
NO the sand will work it`s way to the bottom and you`ll still have the CC at the top. Your sest bet is to remove the CC 1/4 at a time and fill it back in with sand.
Actually if amphipods and bristleworms can be siphoned through a gravel vac, I'm pretty certain just about anything else can too. I'm all for gravel vaccing no matter what substrate you have and you'll definitely need one for CC.