My livebearer book says they are I believe. But the ones in my 75g are everywhere. They may tend to stay together somewhat, but not what I would call schooling, maybe shoaling, if there is a difference. But then again, my males and females are all in the same tank...so you know what their togetherness is driven by...
If you compared them to blood fins or rummy nose, maybe even as far as neons or cardinals, they don't even come close to schooling, IMO.
i think they would school if they were the same color/type. I had some and they did school if they were similar but those that werent usually did just hang out then leave again. If you get any, get them soon because they will get slightly territorial and make sure you get them of the same type. If you get some that are more fancy than the others, then they may pick on or be picked on.
A male guppy is completely content by himself, even happier if there are a couple females. Most guppy breeders agree the ideal guppy group is one male to every two females. A larger group than that is usually a bad idea in a community tank, since the population tends to grow to fill all available space.
FWIW, I have a single male Guppy in a 125g tank that has about 60 varous tetras, 4 Angels and 7 Cories. He seems pretty happy, although I have thought of throwing some other males in there for company. He came with a tank I got back in SEP. Just haven't moved him to my Guppy tank yet.
Male guppies don't actually become more happy with other males around. If you want other males in there, and they get along, that's fine, but don't do it for the guppies. They don't really want the other males around, and can actually be a little territorial towards each other, although less so if there are no females around. Although it seldom leads to damage, there can be some picking and chasing and displaying at each other. I've had male-only ten gallons with twenty plus males and everybody was fine and nobody was injured.
Considering it's a 3 gallon tank I have him in (they get to be 2", or so I read), and that he's a male, I will be sticking with just the one. Especially because I had dreams to breed RCS in there, and I'm betting the majority of the babies will end up as guppy snacks. Right now, thankfully, he's too small (less than 1/2") to be much of a threat to the babies. Maybe I'll get a crop or two of RCS babies before the guppy grows up.
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