is there any type of predatory/aggressive fish for a biocube 14 if house alone, I want one and I already have this tank running it would be its only inhabitant with 40 lbs of LS and 18 lbs of LR.
you could do a leaf scorpion fish, or i think a waspfish, maybe a dwarf lion? or an angler that stays small... mostly slow moving fish,, since they dont need a huge amount of room...but it still has to be pretty small
I say you can put maybe a leaf scorpion in it. But, I must admit, 14 gallons is a very tiny bit of a stretch for any of the very small scorpion fish. I would recommend a good amount of live sand, more frequent water maintenance, and enough live rock so that it could filter wastes nicely, yet still provide enough bottom area for the scorpion fish to roam.
The dwarf lion... I wouldn't.
A small waspfish would fit.
A leaf.... kindda tight. They get bigger than ya think.
They need sandbed space... do you have a picture of how your tank is set up?