Richer,
Can't see the BB on the main tank. How much crud acccumulates in there? If any, how do you get at it to siphon it out?
Also, whether or not you have nitrate in your system, I'd be getting rid of as much crud from your sump as possible. Crud always equals algae blooms of some sort if left in the system.
It's been almost two weeks since I set up our first BB tank. No sump to collect the crud, so I have to siphon out the crud from the main tank. I have left lots of area on the floor of all my new BB tanks so I can (relatively) easily siphon out the crud that settles on the bottom. Dang, I wish I had time to get pics together of the three tanks.....
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