Well, you're quite the hobbyist aren't you? This isn't really a site where you want to come out with a flippant "well I don't really care about them to be honest" remark, especially about clown loaches, a very popular and much loved fish on this forum. You're also ignorant enough not to know that clown loaches have a subocular spine under their eyes. They raise it when threatened and when that arowana tries to eat one, and it will, then it may very well choke to death when the clown loaches spines get caught up in its throat.