I have had my little 3 gallon for over 6 months now and whenever i try to put a new coral frag in it immeadiatley closes completely. i just put a small xenia frag in a few days ago and it hasnt opened at all since. a zoo frag that i put in a while ago still has yet to fully open. im pretty unsure why. i acclimated each of them just fine but they dont do good after they are acually in the tank. in the past parameters were bad and iffy. but now im stable with extremely low nitrates like about 1ppm-ish, no ammonia or nitrites, ph is 8.1, alkalinity is 4(units?)((dkh
?)). im topping off daily or every other day. the temp is a little on the low side at like 76-ish degrees. my only stock is 2 sexy shrimp (and hopefully a pistol soon =}), a turbo snail, 3 dwarf blue leg hermits, and a tiny bumble bee snail. the only other thing i could think of is an abnormal lighting schedule. + or - 3 hours daily.