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Not being harrased and nitrate levels are 5-10 ppm will the goby and shrimp dig a burrow where I can see them or not tang is 3 inches so not that big and not stressed so he will be finelike was said you are heavily stocked. It could be just fine though. The only fish I'd consider worrying about would be the tang.
One of my lrc members has his nitrates up to 100ppm at times. Not saying its the best and he can't keep many corals, mainly only softies. What are your nitrate levels currently? My trate levels have been up to 40ppm and I still have my pistol shrimp. Hasn't croaked yet. However when I went to have my water tested yesterday by a lrc member he said they were close to 5ppm.
Like i said in your other post...don't mess w/your shrimp n goby. Let them be. Messing could kill them if they get really stressed out plus possibly being harrassed by the other fish.