DIY projects

Can two royal grammas co-exist in the same tank?

I've been absent for a while because I've been too busy with college and work, but I'm back now, hopefully for good. I've got a few upgrades coming soon and also some cool "side-tank projects" I want to share with Reef Addicts. But what really prompted me to log on tonight was this: I've been going to school in the mornings and working mostly the graveyard shift, because of this I don't really have much time to interact with my tank other than maintenance. This evening was the first time ...

ive had my 39 gallon going for about two months now with an eshopps nano overflow going into a 15 gallon rubermaid sump. my overflow box is making too much noise, how can i silence it?