07-29-2010, 01:51 PM
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It's true about the WCMM's, they need a lower temperature since they're not tropical fish per se.
If you want WCMM, it can be done, but you would really need a devoted tank to them. (Or them with some other cold-water fish. NOT goldfish.)
As far as the guppies, there's no problem with having a tank full of males. The only problem to watch out for is having too few females. If you only have one or two, then the males will harass them to death.
A tank of all males has no problems though.
I would also find out what your tapwater Ph is before you try to stock. Livebearers prefer basic (high ph) while most of the others prefer acidic (lower ph)
I'll be able to offer lots of suggestions later, but I'm going to hold off until I know your Ph.
You don't want to choose fish, get the tank setup, and realise your ph is way too low. You'll be struggling forever to change it and probably kill fish in the process.
(Trust me, it happened to me.)