Originally Posted by javi
Yes the filter will still work. It will slow the flow a little and need to be checked regularly to make sure it is not clogged but it will work fine.
I, too, have an internal whisper filter: a 10i or whatever. Roy Cherry seems to have no problem swimming around or in front of it. A couple of my cory catfish even swim up against the intake, paying it no attention. I've put my finger against it, and it's noticeably doing its job, but apparently it's gentle enough that the fish don't mind.