Do different types of tetras, for example, Neon and black skirt, produce different bio load, and do they have different aggression levels? Also, since tetras are schooling fish, can I have 5 black skirt and 5 neons be in a school?
Its a 29Yes they are different. The smaller tetras (glowligt, neon) produce less bioload than the larger ones (piranhas etc.). The skirts and neons will not school together if that's what you are asking. Yes, 5 in a school is fine but its best to get 6. Neons also are more delicate than black skirts and would not survive in an uncycled tank.
What size is the tank?
Tetras school, not shoal.I personally have harlequin rasboras and pygmy corydoras, both of which are shoaling fish like tetras, and my little pymies like to school with the harlequins. It's completely possible to have different types of shoaling fish together and reduce their stress levels if they shoal together
I am planning to get 10 neons along with the following:I would not keep Neons with aggressive tetras such as Black Skirts (known as Black Widows here). They will be stressed.
I keep my Neons mainly on their own in a large shoal of 20 in a 40 gallon planted. There are a few Bristlenose fry in with them.
I'm not sure there are any other tetras I'd want to keep with them personally as they look great in a single species shoal.
I tried keeping them with White Cloud Mountain Minnows but the males of this species chased the Neons when they were displaying and my Neons sulked.
They can also be stressed (my observations) when kept with larger fish even if these are peaceful. I think their instincts tell them to avoid being eaten.
I am planning to get 10 neons along with the following:
8 Panda Cories
1 Dwarf gourami
1 Bolivian ram
Tetras school, not shoal.