Wow. Lots of replies. Thank you all. So let me answer your questions: - I would be surprised if the tang died due to tank size stress since he was fine for over a year and just suddenly died. He was laying on the bottom struggling to breath and a couple of hours later gone. Last night he was swimming around eating algae. But it is possible I guess. What do I know? - Didn't register any nitrites and I just tested the nitrates and got 20 ppm - When I said clean the carbon and GFO I meant that I cleaned the BSR and pump and replaced the carbon and GFO with new. Hopefully I rinsed them well enough before putting them back into service. Anyway, it is basically clogged already with algae. - I put all the water, sand and livestock into 5 gallon buckets, sealed them and had it all back in the tank within 4 hours. The water was cloudy for a day and then cleared up pretty quickly to a nice crystal clear. So obviously, the sand was all used and was totally stirred up. - The blue tang is two days old and about half an inch long. We were told it might outgrow the tank and we would need to take it out if it does. - @ska_d, not sure if I had a mini cycle or not. I did the same thing you did the first time. Still, ammonia, nitrites and nitrates are all on the low side. Would I still want to put in some biostarter? Niteout? -@Toronto Guy; it is a dino bloom. Confirmed. I live in Indy and took a water sample and a live rock to both the Reef and Premium Aquatics tonight. Both said dino and probably didn't kill the fish. Both said to increase PH by adding B-ionic Calcium buffer 1&2 5ml 3 times per week (we were doing it once a week). Premium said they thought there may be a bacteria problem since the water is kind of cloudy too. They said do more water changes - at least weekly for now. They also said the skimmer and carbon/GFO BSR I have is not enough and sold me a Marineland H.O.T. Magnum hang on filter. Redundant or a good idea? I also bought their Premium RO/DI 100 gpd system. Will set that up tomorrow. Between the two, bye bye $200.