From past experiences I think a naso tang is will outgrow your 140G. I have a 144G and the naso had to go as she started to get a little too big for my tank and was starting to get aggressive towards other fish. If you get a purple tang it may get aggresssive towards your yellow tang. If you get the powder blue just be aware that they are very prone to ich. I would probably go for the hippo. If you get anthias I beive it is recommended to go for 3 of them. But to answer your question, IMO thats not overstocking.
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