Great. I have a spare mini pump that I use for mixing new saltwater so I can drop that in to create circulation, and a small piece of tubing or something for her to hide in. By "light" I just meant I wouldn't put a plastic lid on the bucket and leave her in total darkness - not that I thought it'd do any harm, just would then need to reintroduce ambient light gradually like when you open a shipping box. Anyway I have some netting I can use to cover the lid so she won't be able to jump out. Fingers crossed I can get the new burrow in there without too many adjustments to the rockwork before she starts a molt.That's how people catch mantis shrimp normally. A 5-gallon bucket is absolutely fine for a few hours, though a pump or airstone would be a good idea. Preferably, give her a chunk of something to hide in while she's in there. No need for light, just for some amount of air circulation and for her to not be able to jump out.