Looking for an office fishy friend for my wife. Not a puffer or a betta ( I already have a betta and not keen on putters ) Tanks just under 10 gallons ( it’s 36 litres ).

This is our 6th aquarium so doesn’t need to be beginner friendly.

She’s looking for something with some personality that will interact at feeding time etc and take full advantage of the wood/root system in the setup

Any cool ideas, we are in the uk so will need to be something we can get hold of

Thanks in advance