whats the average replacerment time for the aquaclear bio-max rings. I'm running 2 AC 300 in a 50 gal. planted tetra tank
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I'm no pro, but AFAIK those ceramic rings rarely ever need to be replaced. You can rinse them in tank water every once in a while to remove any sludge that's bulit up, but they're basically a permanent fixture in your filter.
I agree 
I've been using them in my Fluval 204 for over 2 years and they only every need a quick swish in clean tank water
I've been using them in my Fluval 204 for over 2 years and they only every need a quick swish in clean tank water 
I third that opinion! I have used ceramic rings and similar media for years with no need for replacement. You can swish in clean water once or twice a year, if necessary. Basically, though, this media is self cleaning in the effect that they will shed themselves of excess bio-film as long as a good current is going through them. Keep clean the mechanical filtration in front of them (which will catch all but the smallest particles) and things should be fine.