I've got a pair of clown loach, since last 3days, i have been observing that both of the loaches are sort of staying vertically for most of the time either facing up or facing down. But one of them, has got a bulged belly that appears as if it is going to burst soon. and its mouth is remaining opened widely than it is normally. so watsup with it? the other loach is eating food without problems. are there chances of parasites in water?