pvc size for fire eel cave

[Goonie]

I want to build one and be done. just wondering what size I should go with.

 

[BigDaddyMagnum]

i mean fire eels can get pretty big... depends on the size of tank you have because i would always just go as big as possible especially if you wanna build 1 and done

 

[Goonie]

its a 5 foot 185 gallon, may go with a star light instead haven't 100% decided