Also part of this sytem design was a remote deep sand bed (RDSB)/refugium mounted above the tank so that pods could overflow into the display and feed the tank, while the sand acted as filtration media.
And I want to be very specific here, I fully believe that a well maintained RDSB has great value in processing nutrients in a mixed reef system. I am a true believer, but reality has set in.
It's not easy to do. I had planned to swap out about 1/3 of the sand every 6 months so that there would always be fresh sand for phosphate etc. to bind to. And the issue again is a mixture of difficulty and laziness. Because that tank is mounted up high, it is difficult to work in, and because I let it go longer and longer, I increased the risk of releasing poisoness compounds by stirring it up.
Sherman and I debated for more than a week what my approach should be, whether to remove and replace the sand, lightening the load on the system and giving it more nutrient sink, or to just completely remove the sand entirely and there were strong arguements on both sides.
We were still debating the issue while pulling the sand out in fact, but I ultimately decided that I would rather gain control of the nurtient issue and not have the risk of the sandbed, nor the work maintaining it, and so my fuge is now BB.
Also a note about the fuge: It is way too small to have any impact on nutrient export in a system of this size. It really is just a point of interest to me, as well as a haven for any battered fish, snails, and mollies I use for genrating live food for the display.
All of this change comes at the back-end of a heat wave here, where my system got above 82F on consecutive days and I had a die off of Mexican Turbos. With about 40+ snails dying in the system, the putrid leftovers caused the tank to swing out-of-whack, and a domino effect took place. The brown algae started to bloom, and probably another 5000+ of the snails I breed died as well. So while it seems gloomy to look at the tank, I do have a plan and will continue to execute it over the next couple of weeks.
Hopefully the corals that are suffering will recover, but I can't expectthat until I have the display completely vacuumed out, have increased the frequency of filter media swaps, and changed out a lot of water.
When it rains it pours!