Thanks for the info. Will they eat any frozen foods? What about filteration, I was planning on using an Aqua clear 50 aka 200. I was also wondering if Crayfish dig at all and would gravel be easier for them to do so rather then sand. I have sand and gravel so either is fine for me.
they will eat frozen foods. but only feed them it sparingly. say once or twice a week. feeding is, usually, recommended as "every other day". flake, algae wafers, any veg that is past its best.
filtration is important. i would recommend at least 4-5 water turnover rate. indeed they need, much, the same as fish.
O2 is very important. whatever you do, make sure there is lots of surface disturbance. crays often like to play in bubbles from air stones. but that's all the use they are. airstones and the like, add little to the O2 content of the tank.
most cray dig. Redclaw are diggers. so planting is not really practical. as for substrate? crushed coral is, much, used. but sand or gravel(smaller grades) do just fine.
there is an good profile of the Redclaw, pinned in this section. it may be worth a look.
just post if i can help more.
Ohh, if you are in the UK. the only legal cray you can keep/buy is the Redclaw.