Works perfect just wondered if I set up properly. Used my current filters water to clean all the biomax and foam then rinsed it through with it the plugged her in n let her go. It's a 405 replacing one of two 205s
How big is the tank? If it's large and you still have one other "old" filter being used, I wouldn't worry about losing BB. I'm sure everything will be fine.
But, yeah, sounds like you set it up properly (to me, anyway)
The tank is 5x2x2 and im still running a 205 aswell and a large powerhead with 750 ml bottle full of foam on the inlet for bio. So I do have quite a bit of bb in there.
Malawi500 were in the UK r u