Fish in overflow

I have two green chromis living in my overflow, and my orange fromia visits once in a while too.

I've given up returning the chromis, as they just end up back in the overflow in a day or two. I'm waiting until they get too big to fit in the opening that allows them in. My standpipe has a slip connection at the bulkhead, so I was just pulling it out and using a smaller net to capture them.

The orange fromia is easy to scoop out when he hangs out near the top of the overflow.