Join Date: Jan 2013
Location: Humarock - Boston MA
No shrimp expert, but if this was a fish scenario i'd say just transfer everything over, you'll be fine. If you can put your shrimp into a jar or w/e til your done great. If you have a filter already established them just run it on your 40b. only talking a extra 10 gallons with some shrimp, no fish or anything with a huge bio-load. You'll be fine. If you havent dont your water change yet in the last week, then tonight is a good time to do it. add 50/50 new and old, so 2/3 30 gal tank water, and yes check parameters in the morning.
I'm not into the image, but into the hobby...