Thanks....Some people may say I have the tank overfiltered, but with rays, the rule of thumb is you can never have enough. Currently, theres 2 AC500's, an eheim 2217 in addition to a converted 29 gallon tank wet dry. Even with that amount of fish in there, water changes are done once every 2 weeks as the levels do pretty much stay stable. I do clean the filters in staggered fashion once a month.




