Respectfully this seems quite a bit a of an over kill given the situation. The remaining corals are already stressed and look like they are at the point of bailing. This process will further stress them out. Personally I would just increase water changes and for awhile and leave everything where it is. There is no need to tear down and reassemble the tank at this moment.That is not a problem. how fun = live time runs are the best so glad you responded.
*you need extra clean water beyond the 34 gallons to rinse rocks and hold fish in some new water during tank disassembly and cleaning make about 15 extra or so, 20 extra is best
this is the exact process it will skip cycle fix your tank and give your animals the best chance:
verify water is clean and clear and temp and salinity matched
catch all your fish and hold them somewhere in that clean water matching temp and salinity as well to the current water. Have it aerated and circulated a little while so gasses equalize then add the fish by net right in
the only two things to measure in this entire job are temp and salinity- it cuts down on misreading test kit interference which causes people to veer off and add new things away from the plan
make sure the salinity meter you use is reliable and can’t be off accuracy / re calibrate if needed
cover the fish during holding, we see jumpers a lot during tank transfer work
**your tank will take about four hours cleaning so they’ll be held a while. The container needs heat and circulation
an air bubbler works + heater
if this mini fish holding prep takes a while to secure that’s fine but try and assemble the required supports quickly this water in the tank needs to go to stop the loss cascade
once fish are out you have corals rocks and dirty sand
*before draining water out of the tank catch a bunch to hold in a side bucket this is your initial rock rinse saltwater after we clean the rocks
lift out rocks and set on the counter
add your existing clean up crews still alive to the fish holding container of clean water
dribble saltwater across corals as they sit there on the counter attached to rocks, corals will be fine. Use a kitchen knife to press into target areas and rasp out algae holdfast areas, these are cavities and the rock is a tooth and you’re the dentist, dig firmly be precise. Dig out algae, use a tiny bit of common peroxide on the spot -after you cleared it- to burn invisible anchor algae cells still in the area
do all surfaces, every rock by hand. set the rocks after firm detailing in the old tank holding water and twist-swish to cast off all your knife scrapings
if you missed any, repeat and use the peroxide step.
**final rinse all rocks in one round of clean saltwater / you can pour some clean water over them is ok, this was the final removal of dead plant material the rocks now look like the final pics above.
Sand cleaning is next steps, it’s going to take about 3 straight hours no joke.