hi. has anyone used carib live sand,the type thats not in water but just moist? i ask because my 4 monthcycled tank w/the tank test being perfect and its a brand new tank has killed 3 octos now? and the filters are new. i got all new stuff because of my last tank and acc. might have been used w/copper. could it be the sand? its about 1inch deep. it looked like it was having cunvultions after 3hrs in the tank any one have thought on this? i have a bimac now thats going on 1 year in june.so i no im not doing anything wrong? thanks.