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Or just a large clean bucket with an airstone will do the job temporarily. You would still need to catch the shrimps out. Carbonated water will kill your shrimps. If you are going to clear the tank out, than faced with a choice between carbonated water or boiling water ... the boiling water will work better, if you have no plants. But carbonated water will work better in a tank with plants.

I agree, if you are pulling the tank down, and the substrate needs a change, I would do it all at once.

I emptied my tank of everything but left the substrate in place but it seemed to work and I haven't had any since (years ago now), but I probably caught it really quickly! Going to all that effort I would change the substrate as well as it probably needs changing anyway/soon and the louse or eggs could be in the substrate hiding, would be madness not too change it really if you are doing all this work anyway. Obviously don't put boiling water into an empty aquarium as it may crack the class? Like shrimp the eggs are carried around by the louse but some may have dropped? Completely emptying the tank, thoroughly cleaning/drying the glass and replacing with new substrate should be enough, I would quarantine the plants though to make sure there aren't any on those, well anything that is going back really. As JayC says, you can use a bucket, or any other clean, plastic container! I think I reused the water from the tank as well pouring it through a fine net, then wash the net in boiling water once finished! If you want to be doubly sure, you could put some carbonated water in the tank once you have cleaned it all, deep enough to go above where the substrate line was and leave that over night, then empty that and dry it thoroughly again before starting the new setup? On the plus side, once re-setup that is probably the biggest job done for many years to come. Simon

We have recently started feeding them different food, but noticed a load of these guys today after doing almost 100% water change.

Yeah I was thinking a large bucket would work. Would need another though as my only large bucket stores my RO water. Could stand to have another though I am sure my fiance is tired of seeing buckets all over the apartment! Between the shrimp and my bonsai, I have more than a couple around! Would I need to let the tank sit dry for any amount of time for eggs and things that might be on the glass to die? Wouldn't want to get everything reset, only for some hidden eggs to hatch and have to do it all over again. Also would boiling water alter the buffering capacity of the substrate at all? It is Fluval Shrimp Stratum. Could always just replace it as it has probably been 4 years or so with the same substrate but I am keen to see how long I can go with the same substrate. Regarding the carbonated water, on further thought, just pulling up the plants is a better idea and rescaping after. Nothing fancy I am worried about disturbing.

Watching this page closely as I'm in the same boat, albeit a much smaller and easier to fix boat with only 1 X 28L tank to deal with. Means I don't have anywhere to quarantine the shrimp in the mean time though. May need to get a second tank for that purpose. Shrimp come first for me though so won't be coming anywhere near copper. The drain and boil technique seems the simplest. Would just need to catch all 100 CRS first. Though the carbonated water technique is interesting as it wouldn't kill my plants. If anyone has had success with these methods, I would be keen to hear it!

Hmmm, think I've answered my own question. I think it's mosquito larvae........?