Yeah unfortunately this isn’t a fish that can safely be held in such a small tank while they await larger. They’re very prone to stress. Best to wait until you get a larger setup, and have it stable before trying tangs again. If possible, upgrade to at least a ten gallon for the clown too. You can grab a 10 gallon standard for cheap. It’ll be a bit easier to manage.I trying to set up a larger tank for them but it will not be ready until next month, so sad to lose them but hopefully my clown will be healthy until then.