i thought zoas were easy to keep ? well mine have died for some reason.. im not sure why though. they never opend up at all and now they have almost completely vanished from the rock. the other 2 rocks i have with zoas on seem fine though but 1 is looking like its loosing some buds. any ideas what im doing wrong ? i have a 1 foot, 15watt standard bulb and a 3 foot 30watt t8 bulb. my tank is 3ft long, about 120 uk liters. and i leave lights on for about 7 hours a day