08-09-2008, 01:49 PM
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Hmm that makes some sense. Just to warn you, if you've got a male and female guppy together you're going to end up with a lot more fry, which will eventually overrun your tank. If you don't already have one, you should come up with a plan to get rid of some of those fry. See if you have a friend that might want some, check with your LFS to see if they'll take them off your hands, or cruel as it might sound, see if you know anyone that has a predatory fish that might make some use of them. They'd be glad to get tank-raised guppies instead of diseased feeders from the store any day.
Also, not sure if anyone has pointed this out yet, but your bristlenose plecos are going to outgrow your 20L tank pretty soon. They *are* one of the smaller species of pleco and usually max out at about 5", but they are poop machines and I wouldn't recommend keeping one in anything smaller than a 10g tank. If you were to upgrade to something like a 20g tank, you would be able to keep both of them long-term and also support a larger guppy population.