Looking for help with what's wrong with my BTA. My tank is 4 months old. I've had this and 1 other BTA for 2.5 months and they've been great until this last week. The one on the right is healthy and flourishing but the one on the left hasn't opened in several days now and today it's mouth is gaping. My parameters: salinity 1.026, pH 7.9 (I just added some pH up), mag 1450, Ca 431, ammonia 0, nitrites 0, nitrates 0-5, phos 0.13, kh 120 ppm, temp 78. It's a 29 gallon and I do 5 gallon weekly changes. I bulb syringe feed them a bit of chopped up mysis shrimp about once a week. Please be gentle with me if there's something I'm doing wrong, I'm still a newbie. I just don't want it to die