Neon Goby in my overflow

[Bartman]

I have now removed my Neon Goby from my overflow for the 3rd time. The fish has spent more time in the overflow than in my tank. He/she seems fine and appears to have grown a bit. Any ideas on how I can entice it to stay in display. Tank is a 75G with about 100lbs Tonga with a Foxface, 2 Oscellaris and a Royal Gramma. I've had the goby about 5 weeks.