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a fish deciding to die right in the middle would be abit of a pain, would be a good idea to put some sort of filter so larger fish wouldnt eat the smaller fish /fry, but the smaller could swim in and out as they pleased in the other tank.hope a larger fish doesnt take up residency in the middle of the pipe and block off anyones hopes of "migrating".brilliant idea tho, wouldnt wanna drill holes in my tanks tho unless they were really cheap and not glass...or id do it myself without a care.....on second thought wat if u had a pump/filter running back to ur 20g from ur 10g to pump the water back into the other one
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