yesterday i bought 2 clams from a lfs that was unfortunatley going out of biz..at the time they looked great and closed down when i waved my hand over them....so anyway when i got them home i acclimated them with the drip method over 30 to 40 mins...once in the tank they both opened but one more then the other...i would say 80 and 60 percent respectively...anyway they are under 250 mh with 220 watts vhos...so i fig plenty of light...well this morning the one clam that opened 60 percent fell off the rock and closed completely...i placed him in a more secure spot but so far he hasnt opened up...the other is completely open...im hoping it will just take a couple of days for the one that took a dive to open....what do you guys think