You have got very nice coral! I'm using a 2ft tank, fishes with LR only. Tank collapse 2 moths ago. All the fishes dead within 5 days, I guess NH4 and NO3 spike up. Starting all over again. Care to share how to cycle my tank properly. Presently I do not have any mechanical filter or skimmer. Just 1power head, grade 1 sand and LRs also 2 PL lights(10000k azoo white and arcdia blue ). Please advice if I intend to keep corals. Thank you.