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So yesterday I got 15 neon tetras for my 25g. Just put 'em in yesterday. Well at the pet store they were schooling pretty tightly. I woke up this morning and they were kinda just all over the place, they looked kinda more relaxed and chill. Like they weren't all schooling together, kinda like in one big group, then one little group not far away. I'm assuming this is normal behavior? Could this because I just have them in there by themselves?
 

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I wouldn't go for another whole school but you could always try it out. I'm sure someone else can weigh in on this. I've had neons, cardinals, diamond tetras, etc and the schooling is not something that is a continuous behavior. Maybe give them some time and possibly add a dither fish or two. Google dither fish and you'll get some ideas.
 

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I have 6 Cardinals in an 8gal with an otto and an amano shrimp (i do 2 water changes/week) and although there is a big difference in tank size (and I believe amano shrimp are bigger than ghost or cherry) I can share my experience. My Cardinals don't school consistently either, possibly because there are only a few in a small tank, but they seem to school more when I have the filter outflow on 'high' so increasing flow with a powerhead would induce schooling behaviour, though im not sure if neons prefer slow to fast moving water. Anyway it seems that inconsistent schooling is normal behaviour, as mentioned above. Maybe a gourmai would be a good addition?
 

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There are only a few species that constantly school without there being a threat in the tank. After all that is why they school in the first place, to avoid being eaten by distraction of the huge numbers in a school. In the wild usually the sick or weak fish are on the outside of the school thus not having the protection of the school and end up being food. Rummynose always stick together and from my experience with other species is once they know there is no threat in the tank and become comfortable they stop schooling and go about their business without fear of being eaten.
 
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