Your setup looks really good! Only thing I would add is some flat pieces of cork bark or tree fern for him to hide under. I think I see a water dish, correct? Misting the tank every so often is a good idea to keep humidity up. I would keep the humidity over 50 percent but don’t let the soil become water logged, it will spoil and stink.They like it cool so don’t let him get over 72 degrees, it will hurt him for sure. An air conditioning unit is the best way to keep them cool unless you have a basement which would be even better. He doesn’t really need the light and that may be what’s still stressful for him. They are voracious eaters and will eat just about anything small enough to fit in their mouth. Small crickets are good but only put a few in at a time because as discussed they can chew on your salamander. Isopods (pillbugs) are really good too and you can put plenty of them in his tank and they may breed and start a small population for him to eat. The best kind for your salamander would be rough grey isopods and dwarf white isopods. They will also clean up waste matter. Small earthworms, tiny white slugs, waxworms, house flies, black soldier fly larvae and bean beetles are all good choices too. If you go to Caudata Culture they will have articles on different foods and nutrition. Good Luck! The long tailed salamanders are a beautiful species and one of my favorites! Also, a tight fitting screen cover is a must!!! They are escape artists of the greatest kind! Josh