Clean all of your other filters in the 210. It will look disgusting and seem wrong, but it'll seed the filter faster than anything. After you do that, either move the aro right away or keep "feeding" the bacteria that are alive with ammonia of some sort. I usually just move the fish and I've never had an issue.
I've got tons of practice because I'm a terrible impulse buyer lol
I've got tons of practice because I'm a terrible impulse buyer lol
