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I'm setting up a 29g tank for a breeding pair of angelfish. This is my first foray into a bare tank. There is a large sponge filter, a heater, a Fluval U2 filter modified to prevent fry from getting in. My question is where are the BB going to reside? Does this configuration make it harder to achieve and maintain a healthy colony of BB due to a lack of colonizing surfaces?
 

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^^ It's in the filters, on the walls, basically anywhere that is wet and not a fish.

As for making it harder to achieve a colony of BB due to lack of surface area: no. You should still cycle the tank, but it shouldn't take any less long than cycling the tank with substrate does.
 
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