Sounds to me that you have a Hillstream Loach aka Hong Kong Plec.
This fish is a loach and not really a plec. REal Plecs have a
reputation for harming goldfish which is why people often throw their
hands up in alarm when these fellows are mentioned.
You should have no worries with a Hillstream loach though cos its a
different fella entirely, despite the name. Generally speaking they
will feed on algae in the tank and not require any feeding, but
putting in the odd slice of blanched cucumber or courgette will be
welcomed.
>> Stay informed about: Feeding/food and names....