<a href=showthread.php?s=&postid=15200363#post15200363 target=_blank>Originally posted</a> by Bricky
To help Lorenzo and all others such as myself that own a BK400 Internal I'll try to explain what Proline shared with me last week.
According to Klaus the RDII (170w version) pump wouldn't add enough performance to make up for what the original pump is lacking in air input. It looks like the best option is to add another RD 2500. Ofcourse this means that the body has to be drilled. Both on the exterior and at the bubble plate.
I personally am a little nervous about this solution. I do have a friend that builds tanks for a living and could do this, but I don't know if I want to risk damaging the skimmer body.
I'd like to just get a new body and the additional pump. Then this skimmer would be where it's supposed to performance wise. My understanding is that the newer 400's have two pumps to correct the performance issue. I just don't feel like shelling out a ton more money though. The pump is one thing, but the pump and a body is a whole different animal.