Well, as the title implies, I am looking for an eel like fish (not a loach) that would be suitable for a 20 gallon tank (60x30x40cm). The only other fish in the tank is a thorichthys aureus which will be moved to lager tank relatively soon. One that does not require sand would be ideal but not essential. I realise that I am fairly limited due to size but surely there must be something out there? any help would be greatly appreciated.