Hiya melo!
I LOVE your avatar BTW! GO COWBOYS!
I am feeding mysis once daily and, from what I've read, my goby needs a couple of feedings, so I've been dropping a tiny few pellets of sinking food in front of his cave once again in the evening. Unles the clown sees it, he gets to eat it all. I don't see any old food left in my tank in the moring, as my ever-growing hermits leave tracks all over the tank each night and scavenge the rest.
Maybe more frequent
PWC with distilled water?