i am having no luck with my tanks. i first had a 55 and now want to move to a 125 but am having no luck with keeping live stock. i'm on the verge of quiting all together. what do i have to do to maintain a safe and health tank. i currently havve a 125g with wet dry 2 heaters a coralife 72in with power compact 50/50 about 100lbs of live rock and will be picking up 40lbs of live sand and a berlin protein skimmer? what else do i need or what else do i have to do?