in my 29g i have 7 rummynose and 6 neon tetras. i no tht if u get a predator or if u hv alot than they will school more. but what would be some predators i could get that would not eat the fish.
Not all the time at least. Many of them do at times throught the day, but the tank needs to be large enough to allow it. It's not like fish either school or shoal - that's just a description of what the group happens to be doing at any given moment. Granted, some species spend more time doing one than another.You have no space left for fish in the tank.
Most freshwater fish do not "school" as marine fish do. Rummynose tetra are about the best for this, but no FW species school in the strict sense.
OH YEA??The definition of "school" and "shoal" is not always clear. The ones I tend to use apply "school" solely to marine fish, and this means the species remains together 24/7, they hunt/feed as a pack, etc. As far as I know, no freshwater fish does this, at least not strictly. "Shoal" on the other hand refers to the freshwater species habit of remaining in large groups that may form a "pack" for various reasons, but also separate partially and/or completely, and they never hunt as a pack with the sole aim of bringing down prey together.
I acknowledge there are sources who reverse these definitions, or who do not apply them like this at all. This is why I tend to use shoaling for those freshwater fish that must have a group to avoid stress in general, such as the characins, cyprinids, some catfish, etc. It is certainly true that the larger the space they are in, the more they generally remain close. And when threatened they will tighten the shoal even more.
Many of these species do not actively swim much to begin with. Rummys as I mentioned are the best example of an active-swimming fish that does tend to remain in a close group while swimming through the tank. Many others, such as cardinals, the Rosy clade species, and so on are quite sedate, remaining in close proximity under the shelter of plants, branches, etc. Rasbora are like this too.