my bala sharks recently swimming side by side like right next to each other(they swam together but not this close)sometimes bumping into each other stopping and facing opposite direction floating there twitching tail fins then swimming like they normally would... they are swimming right next to each other more often- is this fish love? aggression? space issues? ich? cuz they rub on each other sometimes(no rubbing on decor or visible ich spots thou...) or is this totally:;fru normal and i shouldn't get hopes up for eggs, or be worried.