i have the perfect sand sifter for ya,the black banded eel,i had one for years, soo cool,docile,wiggles/sleeps though sand all day,pokes nose out for food gentile slow moving ,in and out of sand all night,kept mine in open top 75 about 3 yrs grew from 18"-24",only big around as a penny,i tagged you to a thread here ,from google
I'd be concerned about it going after some of the smaller docile fish I'd like to keep namely the two mandarins I want. Beautiful eel though! Not sure if my aquarium is large enough for one either if they max out at 36"