Hello again,
We need to try and get your temps down for your beardies sake. So you have a 125W Solar Glo, which is an mvb(mercury vapor bulb), plus you have an ordinary household bulb, correct? Okay...with that size tank and your room being 87 degrees, you do not need that extra bulb on in his tank. All you need is the Solar Glo mvb and that needs to be raised to get your temps down. 10" is way too close for an mvb, like Tracie mentioned you need to have a minimum distance of 16" from bulb tip to beardie with that particular light.
Unfortunately, your beardie is going to get dehydrated if his coolside temps are not brought down. With the coolside being 90+ he simply has no way too regulate his body temperature and cool himself off. It is extremely important that you get that coolside temp down.
Do you always have the extra bulb on? Was it on when you took the temps that you mentioned? If it was on, then the solution would be to turn it off and lower your basking spot to the minimum distance of 16".
When you take the temps on the basking side with your temp gun, are you aiming it directly on the basking spot under the light?
I noticed another light fixture on your screen top, what is that one for?
You mentioned your little guy has been a bit lazy and his appetite is off. This could be because of him shedding and possibly overheating also. I would recommend
bathing him at least every few days. Have you bathed him in the last few days? Did he seem any better following his
bath?
I almost forgot to mention that the mvb's need changing every 12 months(not 6 months). So yours is still good for another 6 mos.