Missing Fish

Hello everyone!

Apparently one of my fish, a sleeper banded goby, has gone MIA! I've heard of gobies jumping out of tanks, but no evidence of a suicide. I have even looked under some rocks to no avail. Has anyone had this happened before, a fish totally disappear? I assume the guy died and maybe the CUC got to him or he burrowed in the sand and died? I am concerned about the rest of fish. I have been having a bubble algae outbreak (not sure if the two are related so I increased the size of my CUC)? I haven't checked ammonia or nitrite, is it worth checking if nitrate is reading 20ppm? I am sure the nitrate level isn't helping the algae problem so I plan to a major water change this week. The tanks been running for about 6-7 months.

Here are my parameters:

Tank size: 30gal
SG: 1.026
temp: 78 deg
PH: 8.1
Nitrate: 20ppm
Phosphate: 0

Haven't seen him since. Agreed, I have never had a fish simply disappear completely. It must have burrowed and died. It would be a major effort to start sifting sand and removing all the rock to go looking for it.

Last seen 2 weeks ago. Pretty sure the CUC and maybe the wrasse got to the body. I had a pH drop and a nitrate spike.

@oriongirl. A clownfish, hippo tang and six line wrasse.

Probably swap out the tang for another juvenile down the road...I've had a couple of them over the years so I am pretty good at keeping them. The Hippo is an awesome fish to have!

I do a 20% water change at least once per month, sometimes bi-weekly.