I would like to know how thick the pond liner would have to be since I am housing 3 Megaladoras uranoscopus and plan on housing three more. I am only asking because they're the ones with the most and sharpest spines out of all the fish I am housing.
A 30ml would work but the 45ml will last a hell of alot longer. It just depends on what ur willing to spend. How large is the pond your putting them in?