Here's some new pictures updates. Recently, I had purchased activated carbon branded 'black gold'. Now, it's not black gold as in oil, but specialized processed carbon for chemical filtration.
It really does work wonders. My marine tank water used to be a bit yellowish after 7 days. Since using carbon, it's still pretty clear. Now I could change waters 2 weeks once, and not weekly as I used to.
I've also replaced all the fine sand substrate with larger coarser substrate made up off coral fragments. The problem I had was sand on top of corals, which I think caused growth problems for them.
There's one SPS coral that managed to regrow back after almost dying. That is perhaps the best motivation to maintain the marine tank.
