I'd return the loach as they get about 4-5" and need to be in a group. The SAE might be manageable but they also get about that size and are pretty active. Aggressive probably isn't the best word to describe either but they may act out if cramped.
If you do though you would probably have room for a harlie school.
There are also a number of smaller loach species that are more suitable for a tank this size...kuhlis, sids, etc.
Thanks for the advice. It is my understanding though that skunk loaches don't like company unless it can be done in larger groups, otherwise they fight. Is that not the case?