a word of warning on the subject of glues. I bought two 2oz bottles of reef glue several months ago that boston aqua farms sells, it is coraline purple colored. I opened one bottle and used it a few times for small stuff, and never opened the other bottle. after about two months they both were hard as a rock in the bottle. they werent cheap either. I dont know if I got a bad batch or if I did something wrong to cause it. I stored them in a cabinet I store all my glues in. it says on the bottle to store in a cool dry place, so who knows, Ive heard storeing your glue in the freezer or fridge is a good idea but havent ever tried it. anyway, be prepared if you buy this type of glue for it to harden quickly, even in an unopened bottle