
I wondered if someone could give me some advice/reassurance: I have a small clown (1.5" est.) and a pair of what were sold as polkadot loaches. The polkadots are slightly bigger (at 2-2.5" est.).
I have a piece of bogwood and a slate cave, as well as several plants, as hiding places. The clown was in the tank first, and I introduced the polkas slightly later for company.
However, the clown has since become very reclusive, and seems to be 'bullied' by the other polkas. I was assured by people and articles online that polkas were friendly, small and would get along with my clown (who likewise would be sociable). I assumed they were establishing a pecking order: the polkas do not work 'together' and nudge each other as much as they do the clown.
I'm worried now though because my clown looks quite 'thin'. His colouring is fine and he has no sign of illness. It seems as if he is either not eating through concentrating on 'defending' his cave (his preferred hideout which the polkas keep 'invading'). That, or the 'fighting' is causing this to happen.
Because he spends his time in the cave I don't see much of him to keep close tabs on his condition: just quick glimpses perhaps twice a day.
My questions are:
Is it a mistake keeping mixed botia species together like this?
Will the 'fighting' settle down?
Are polkas/botias ever known for effectively killing a rival? I know the fighting isn't vicious enough for them to injure one another seriously but it seems like my clown is being starved :O

Quick note on conditions: very regular water changes (2 times a week of 15-25% each time), and feeding 2-3 times a day with mixed food (flakes + bloodworm or brineshrimp).
The polkas are doing fine...so I know tank conditions aren't terrible.