Hello all, new to site and green to hobby. I recently bought a used biocube29. Ive added a skimmer, heater, mixing my salt water with red sea and water from store. Had the tank cycle with 25lb of LR, 20lb of sugar grain LS, 10 lb of dry aragonite 1mm, and 8 oz of instant ocean live bacteria. Had it cycle for 2wks. Added my CUC for a week. Bought 5 damsels, 3 didnt make home, 1 died 3 days later. Still got 1 fighting like a champ. Bought a 5 more. Now im left w 1 domino and 2yellowtail. Now for the "i dont know what happened" look. But my water looks bubbly or debris. I think its my filtration. Want to upgrade, but their so much to choose. I also bought a few different lighting (led and mh). I need help frm experienced aquarist as to which direction or option would work best. Do apologise if i was writing a book. School os now in session, any suggestions.