thanks for the baking soda idea, hadnt heard that one before, but it makes sense. Also, I had about the same thoughts on moving males around. I know in the other colonies at school they keep them together full time and actually had quite a bit of trouble trying to get some new males introduced a while back (the lines were getting a little inbred, litters were getting smaller, etc.) because the females were goin nuts on em. They keep 1.2 or 1.3 in small lab type tubs with metal lids that are probably about the size of a shoe box. The smell does get rather strong in there though, so i will probably go with 10 gallon tanks.
I bet if you check around, there is a paintball store somewhere near you (often as part of an army surplus store) where you could buy a tank for between 20 and 50 bucks depending on size and one of those valves for about 20. The tanks cost around 4-5 to fill, and id say one tank would last a long time for gassing. If i ran my numbers right, that should be around 980 cubic feet of co2 in a 20 oz tank (which i think is usually around 30 or 40 bucks) but ill double check that tomorrow when im not so tired.
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