Originally Posted by tanker
I thought all of the fish I have were supposed to be shoaling. I've got 7 of each of my tetras, 6 dwarf neons and 5 pandas but none of them seem concerned about being out of their groups. The rosy tetras seem the most "groupy" but the rest are just spread out all over the tank. Are the tetras supposed to be shoaling (I thought they were), or are the ones I've got not so "groupy"?With good reason, if they all ended up eaten!
As Byron has noted, In the wild,, these shoaling species Shoal,or school if you will in the hundreds,perhaps thousands. They often do so for protection, it is much more difficult for predatory fish to single out one or two fishes in this way, and the shoaling or schooling fishes ,have many sets of eyes on the lookout for such predators as opposed to just three or four sets of eyes.
The minimum numbers suggested for these fishes in aquariums are just that,,minimum. They are much more likely to shoal in larger numbers but tanks should be able to support such numbers and maint should be performed accordingly. (more fish,more pollutant's from food/waste).
In an aquarium with little threat of predators, the fishes feel more secure and there is less need for shoaling.
They will explore all regions of the tank, but you may observe that of an evening ,,and just before light's on of a morning,,that the fishes will be in tight groups for they feel safer in numbers while resting/ sleeping.
Yet other species,,will nearly always travel in groups. Smaller the fish,,the more likely to shoal in my expierience. But agian,, If there is no threat perceived,and plenty of cover in the form of plants real,,or artificial,,, the fishes will be more comfortable and will explore all regions, and only travel in tight groups on occasion.
Have also observed that smaller fish seem to shoal more so in larger aquariums ,as opposed to smaller ones.
When traveling the length of large tanks,,they feel safer doing so in groups.
Just some of my observations.