At this size they're as hardy as it gets. The HITH will go away over time with frequent water changes. Not uncommon at all for them to get it. They look like hybrids. Also if they're the same size as your arowana, I'd not worried about it too much as long as they're fed and look stuffed everyone will get along. Except the Oscar... that will probably take time for it to get over the fact his tank just got a bit more crowded lol they like to bully newcomers from my experiences.Thanks I'll stock up then as I imagine they eat alot! I'm hoping he hasn't fed them exclusively on feeders as they're 9-10" so they would probably be difficult to get onto frozen and dried foods. In the second picture it looks like one of them have a bit of HITH, is this something that is easy to treat? Could just be a bad pic though.
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