Aye, ive had 5 in one 5g tank with a wet paper towel or actual towel on the bottom, but i have never traveled as far as you will be. But i dont see a problem as long as thay are the same size and well tempered, but keeping the climate within acceptable ranges with multi breeds may be an issue. You could try Carboard dividers in the tank or plexi.
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As environments change, no human ideal standeth sure...
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