Pests migrating from refugium

[asylumdown]

Originally Posted by Doug

So I cancelled my refugium and will drill my 30g for an overflow to make one. It will sit higher than the sump and drain into the return section.

I've always wanted to do that. Multi-tiered systems seem like such a good idea to me, using gravity to do do most of the work for you if you've got the space to do it. In my dream system I'd have a frag tank, a refugium, and a separate large vessel that could be isolated and drained for water changes all arranged in a cascade and powered by gravity