I thought danios were 'temperate' not tropical since they're happy in water as cool as 18C / 65F .. but if they're too boisterous / aggressive then that's another issue altogether, I've just seen them suggested that's all
Is there any other small 'space filling' that would be more appropriate?
That's why I thought it best to double check here!
Just like I've read that they require 20 gallons for the first fish, then an additional 10 per fish
So my thought process was.. 20 gal black moor, 10 gal fantail, 10 gal smaller fish
sorry I meant, an additional 10g of the tank for the fantail, like I was allocating the space in the tank if that makes sense? .. do fantails require more space than black moors?