This thread has really been quite astounding and has offered insights into a variety of issues regarding tank maturity and sandbed maturity that I hadn't had previously realized or considered.
I am a a follower of the theory that OTS is primarily caused by sandbed saturation, and as a result am setting up my next system to include a DSB 'fuge in-line to the sump which I will be able to fully detach from the system, strip and replace. I haven't done this yet (still setting up) but I've thought about it a bit.
I had to move my 29g last October, and since the 2" deep crushed coral (TBSW LS) sandbed was going to get stirred, shuffled, shoveled out and replaced anyway, I assumed (perhaps wrongly) that any layers of nitrification, denitrification, et al., bacterial would largely end up in the wrong places and would mostly be destroyed. Oddly, I didn't see any increase in algae growth that I would have expected. It may be that my sandbed is so shallow that stirring it really doesn't have much effect.
It would seem that the act of upgrading aquariums (moving, as I'm planning, the contents of a 29g to a 54g+sump system) would reduce some of the maturity of the tank. The amount of sandbed disturbance, repositioning of rock, larger water volume, etc., represents a really large environmental change. Unfortunately, when this sort of thing is being done, one wants to put all the critters from the old tank into the new.
Do you have any suggestions or thoughts on this, given that some of the creatures we have stewardship for definitely require a mature tank, and the act of moving the contents of an aquarium in which they are settled and doing well might disturb or endanger them?
Thanks,
Ratty
(Click the little red house to see my 12g and 29g reefs!)