Hi all, I'm back for a couple of days- the thread continues to be interesting and useful. Oh, ZoeReef, no offense taken, just my dry, self-deprecating sense of humor. Doesn't always come across in posts. I noticed on the previous page that Scott had posted the basics for utilization. I was wondering if these came from the manufacturers? I'm sure there is a good reason for them, but I was wondering if they published their rationale, as I can't figure out the reason for a couple, specifically, heavy skimming and no refugium. Now I can sort of see the heavy skimming on the idea of removing planktonic bacteria from the water, but in most systems there are comparatively few bacteria in the water column compared to the substrate. Usually there are 10e4 - 10e6 per ml in the water, compared to sometimes 10e9 - 10e15 in the sand. I don't see any really significant benefit to removing the relatively small biomass, especially since the heavy skimming will also remove a lot of the amino acids that are being dosed in some of these products. The added quantities of bacteria could also be helpful with regards to coral nutrition and growth. Skimming is a nice insurance policy in case of product misuse however, to protect against massive blooms of bacteria and subsequent overnight oxygen depletion. I had one of these when I was experimenting with polygluconated calcium additives, and lost most of a 70 gallon tank in 6 hours.
Now, the refugium question; I really can't see a reason why that would be contraindicated. I would think that using these additives would be especially useful in a system with a refugium. The large biomass of bacteria in a refugium would seem like a great target for feeding- it would just increase the efficiency of heterotrophic and autotrophic processes that are already present. Added microbial biomass would sequester nutrients from the tank water, and form a good base of the food chain for refugium critters like pods, worms, etc, and the larvae produced by these are an ideal natural food source for corals and fishes alike. I use remote deep sand beds, and whenever I want a little added oomph out of them, I just take some long forceps and jam a sugar cube to the bottom of the 20" bucket. It diffuses up slowly, and the carbons are probably re-used dozens of times before eventual release. Each use utilizes energy and additional nutrients, taken from the water or other bacteria etc.
Of course, every system is different- what works well in my system, could trash another. But the general microbial processes are pretty similar in most. I think for all of these additive strategies, the biggest thing is starting in moderation and being consistent. Corals are also pretty adaptable creatures and are adept at maintaining their own preferred homeostasis when faced with varying environmental conditions. To aid them in this endeavor, keeping good flow would probably be the biggest help we can provide, as it will allow them to shed or excrete unwanted metabolites, bacterial species, or other challenges that additives like these may provide either on a transient or permanent basis.
So there is dissertation # 2.
I’ve gotta get a new hobby.