Need some help

[mark1187]

hey, I have a 50 gallon tank with 2 cown fish, wrasse, rhino blenny, orange diamond goby, jawfish, and black brittle star fish.. one of my problems is I cannot find my jaw fish or diamond goby anymore.. it's like they have totally disapeared... it has been about 2 weeks since I have seen them. Ive done all my water tests and evrything is normal.. any advice?

Also I noticed something on the sand that almost looked like a little bug smaller then an ant running all over te place.. I have no idea what it is??

Thanks
-Mark