driftwood, and bichir are much easier to feed and otherwise house then spiney eels are. btw black spotted eels ( m. dayii ) get bigger then 20" i have a 2yr old that has outgrown my 75. What else is in your tank?
You could also go with reedfish/ropefish they are like a inbetween eel and bichir(they are in thebichir family) so they would be easier to keep and you could get more then one they like company.
You could also go with reedfish/ropefish they are like a inbetween eel and bichir(they are in thebichir family) so they would be easier to keep and you could get more then one they like company.