Clowns do best in groups. The more the merrier if you want to enjoy all their quirky behaviour. The fact that you've only got two, and they're juveniles too, tells me that the poor little guys are stressed. A stressed clown loach is like a dinner bell to ich, which they have duly contracted, no surprises there. They also usually only raise their subocular spines when threatened or generally unhappy.
So there you go, read the signs, and remedy with a visit to the LFS for more clowns, once you get rid of the current ich outbreak that is. Don't forget to quarantine the new guys.
Just an afterthought too. I have absolutely no idea about green terrors other than they are a cichlid. Their name tells me they are, well, terrors! Are your clowns getting bullied by the green terrors by any chance? Maybe someone has some better knowledge and could clear that potential problem up.
So there you go, read the signs, and remedy with a visit to the LFS for more clowns, once you get rid of the current ich outbreak that is. Don't forget to quarantine the new guys.
Just an afterthought too. I have absolutely no idea about green terrors other than they are a cichlid. Their name tells me they are, well, terrors! Are your clowns getting bullied by the green terrors by any chance? Maybe someone has some better knowledge and could clear that potential problem up.