I have a cowfish that has more then doubled in size in a few months. At first I had to take a couple of powerheads out, but he is now fine. One thing you cannot have with a boxfish or cowfish is a cleaner wrasse. They pick at them and stress them out seriously. I had to trap mine and give him away. Now Norman is happily swimming around, king of the tank. He does not nip at anything, but I think each fish is different. I hand feed Norman, but not as often as I used to. When he first came he was a little low compared to my other fish and I had to make sure he was getting enough food. I do know they are toxic, but I am not really sure if they would bomb your tank or not. I have just made sure Norman has no worries and he does just fine. He is one of my easiest fish to keep and fastest grower.
One thing to careful of if you hand feed... their horns block their vision a little until they get used to being hand fed... he nipped me a few times and it freaking hurts!!! He is a voracious eater, which must support his very rapid growth, he is getting huge.
I have three K700s in my tank but like I said before I had to remove a couple until he grew out. I also have a wave maker which makes the powerheads kick on and off so he is not always being blown. He is now big enough that it does not bother him a bit.
I waited a very long time to get Norman and Colby at Elite got some larger then usual cowfish and I had him on hold for a couple of months. Then he stayed in a peaceful 90g in my basement so he could get used to things and I could get the cleaner wrasse out. The cleaner wrasses really do stress them out and you cannot have one, no exceptions.
Hope this helps, and if you get one, they really do become a pet.
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