Questions

I have two problems going on. 1) Starving Goby and 2) Cloudy Water. Right
now I'm a little more concerned w/ problem #2, but would appreciate any
advice you have regarding the Goby. Hope this doesn't take too long to
describe but here are the details....

1) I have a clown goby that will have been in the tank 5 months as of next
week. When I bought him he appeared healthy. Sometime about a month ago I
noticed he had gotten a lot thinner. He eats everything I put in the tank,
but probably 4 times out of 5 he will regurgitate it back up. I see fish do
this a lot so I hadn't thought much about it until I noticed him being
thinner. There is a purple tang, lavender tang, cleaner shrimp, mandarin,
blue damsel, banded Goby, and ocellaris clown also in the tank - all look
healthy. All have been in the tank longer than him except for the banded
Goby. Lately I have taken extra care to make sure the Clown Goby is getting
a good portion of the food during feedings. I have fed him mostly mysis
shrimp and flake food since he's been in the tank. This week my LFS
recommended trying feeder guppies. So yesterday I bought a couple dozen and
put some in the tank. He could not catch them. So I decided to put him in
a smaller enclosed area to give him a better chance to catch them. The
problem was I couldn't find anything to put him in. Not thinking about
potential problems, I took a piece of tupperware and washed it off real good
and floated it in the tank. I caught the Goby and put him in there with
some guppies. This freaked him out too much and after about 3-5 minutes I
ended the experiement. A little bit later I noticed the tank water started
to get cloudy (see problem #2). Later last night, I also noticed several
white spots on the Goby - they look to be too big for ick - there are maybe
3-4 spots. So I will need to identify what that is and if its related to
his not keeping food down.

2) Sometime after the Goby in tupperware experiement I noticed the tank had
gotten cloudy. I was not concerned about it last night thinking it may have
been from the fish chasing some of the guppies around the tank. (the banded
green goby is a digger and he was all over the guppies in tight places where
they were hiding and stirring up the substrate (which is fine aragonite
sand)). I had also trimmed some caulerpa in the sump/refugium and that
usually causes it to get a little cloudy for an hour or so. This morning,
when I got up- it still appears just as cloudy. And the only thing I can
link it to is the tupperware floating in the tank (for under 5 minutes)? Is
anyone aware of some kind of reaction sal****er has w/ tupperware? I am
testing water quality and so far nitrates are 10 - which is about what they
have been the last 6 months). I have not tested ammonia or nitrite yet - (I
have to run to the store and buy some kits as I have run out of these two
tests) I'm thinking these are more likely to be the affected parameters.
All the tank inhabitants do look ok.

Tank:
75 Gallon
VHO lighting
20 Gallon Sump/Refugium w/ sawblade caulerpa
portein skimmer in sump - a "noname" brand
3 power heads
DSB
about 100 lbs of live rock
1 feather duster
1 brittle star
1 favia speciosa

Tank setup in current configuration for over a year. Any suggestions on
either issue is appreciated. I am most interested in knowing if I made a
mistake w/ floating the tupperware?

Thanks
Otto