One of the guys who works here did a bit of crayfish trapping the other day, and came up with a mamma loaded with eggs that seem to be quite far along. For now, she's in a 5 gallon aquarium with filters set up to NOT suck in the tiny babies when they swim free, and nobody else in with her and her brood. The last time we had a mamma with eggs, we weren't paying attention, and when they swam free of her, we didn't notice. So most of them were sucked into filters, eaten by fish and other crays, etc. We did manage to save a few of them when one of the people who works here's daughter saw them (all of us are older, and have crummy eyes, I guess). Anyhow, this time we shall do things differently. Here she and her babies are: I'm not sure how much time we've got until they break free and start cruising around on their own. I'm thinking of setting up another 55 just for the babies. If we do that, maybe we need to provide it with some kind of special insert for the bottom to provide separation between them so they don't all eat each other right off. I'm thinking of something that will provide a lot of individual hiding places. Perhaps an array of short pieces of PVC pipe all glued together to make kind of a honeycomb setup. We won't have time to do a long, drawn-out cycle, so I'll probably steal a lot of gravel from another tank's undergravel filter along with some filthy pads from that tank's two HOBs as well. And we'll just do enough water changing to keep things under control. Fortunately, we have what amounts to "pond water on tap" whenever the water plant is running, so it's easy to obtain perfect preconditioned water for them.