Wow, that's serious serious business reefing above that looks like a zoo exhibit wow! Working dual custom runs here/ love it/ so am circling back to
@ReefTanker91 plus these small details might impact your planning
@oldmonk
Rt91 in your list, list #5 to stir up detritus so it'll be removed when you finally drain the tank: that's coming before step #6 to remove fish, meaning there'll be cloudy water before you remove them, that needs fixed. No detritus clouding permitted around animals
Since you are doing the ordered, disassembly cleaning on a nano I'm confident this little adjust will be perfect. If you can set one decent sized well- cleaned and prepped rock into any holding bin in the center it will keep the ammonia from rising without having to use additives we're not sure of for the protection (such as prime or bottle bac, we never used them here)
OM
That system is huge, huge. One of the biggest jobs if not the biggest here, due to that massive wonderful fish diversity and a lot of rocks and corals- the value of these two reefs coming up for surgery is really amazing I'm simply lucky to have these two plans in action.
This big system bed removal has extra variables compared to other jobs here, we need to make a couple unique planning choices at the start here.
The firm reliable rule for cycle control during materials handling is that ALL home reef systems stack surface area and bioload in the display, in similar ratios of life to water to rock regardless of tank size, making my puny one gallon reef behave exactly the same under surgery like this giant big tank will do. The ratio is what links our two opposite tanks into the exact same cycle control rules, to the degree anyone who owns a seneye is welcomed x1000 to test the post transfer and tell us about ammonia. Only seneye though, no api ammonia relays allowed (causes fear in the masses whereas for sixty pages we're fear free)
We have never asked for, nor received ammonia testing in this entire thread for that reason-》 we already know what the cycle outcome will be if cloudless work (around the animals) is effected and this is assured for that giant system above just the same.
*to use old tank water in the system with animals gone already is a really good way to rinse off live rock and make use of that water before discarding* but your job brings in the very real possibility of fish disease planning as a new safety variable we must factor here
Ive observed and have mentioned in discussions with Jay from the disease forum am seeing upticks of latent disease outbreaks in large multifish system transfers to a higher degree than normal and this isn't happening in clown/goby setups. It's those tang communities and angels and such, somehow tomonts and such that were originally suppressed express soon after the transfer in growing cases
The actual work being planned can cause outbreaks of latent disease in these specific type setups having nothing at all to do with recycling and nobody knows why. I catch the patterns by doing follow ups with these jobs here
Something about the current stasis of the system, with that degree and speciation of fish with fast pure currents, very busy very healthy setup in motion: actual disease suppression is at work in this ecosystem and it's relative to the degree of initial disease planning given to this system potentially.
If you practiced true fallowing of entrants into another tank as monthslong observation before installing here, that's less systemic loading for disease factors
Same with pre treated or observational quarantine for the fish, if they're prepped there's less chance of carry over expression in the final setup, these small fish risks must be considered. If the system isn't disease prepped but running on sheer skilled balance in that tank + with quality live rock obviously carrying it all/ good feed and strong clean currents, then I must assess via insurance actuary in my mind a risk of 25% for delayed onset crypto battles. Helpful in planning access decisions here
*Size of this job*
That's going to require help it seems, merely lifting that tank for cleaning out, all the plumbing, the cleaning and disassembly work, that's two days minimum it seems? Multiple holding tanks with cleaned detailed live rock inside as mini systems while you hold fish etc, big big big work for sure.
If we do a takedown of a tank to access its surfaces for transfer cleaning or handling, the whole system is cleaned out including pumps, tank walls etc so that we can get all the waste out and none will remain to cloud the refill. That seems daunting here, the degree of teamwork it'll need to safely handle all those materials glass/ rock/ bulk water we'd need to have ready for the refill
You may want to incorporate some aspect of capturing half that water for reuse, for example. In most jobs here we just make all new water matching temp and salinity, but this job is mighty big
I'm bordering on wondering if we should simply spot vacuum remove sections of the sand over time, spread out time, something we never do but in this case is indeed a possibility
In- tank sandbed removal will never be as safe and predictable as surgical takedown like we do, but a balance of practicality might be needed here.
What's your brainstorm knowing all that so far