@fathomer Any remarks regarding my rather dubious tank size selection? Do the eels thicken up and how much activity do you see?
I understand that many saltwater eels meander about live rock and therefore to some extent, require less space. But how about gymnothorax polyuranodon?
Mine are definitely not the most active until they smell food in the water, but even then they would only move around their area, and stick very close to the plants...
As for thickness, mine have got a little thicker, but are no where near what my old fire eel was in thickness at these lengths (mine range from probably 15" - 20"+)
Tank size i would guess a 150 would be more than enough, since i have 4 in a 200G but 3 of them literally live together on side side of the tank, while the other lives by himself in a PVC tube on the other...