I have a 150g and have a small/small medium purple tang in there currently as the only fish for the start of my reef in this tank. Would a small/medium gem tang get along? Have heard mixed opinions.
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^^ThisIf you are just getting started with your tank, as you posted, then stock the tank with everyone else and get the most amount of distraction and chaos before adding the Gem. The distraction of other fish - so they don't focus on just each other - is going to be super important.
Thank you for the detailed response! Great advice.I've kept them together for years. If they are the only 2 zebrasoma tangs you may have issues - This would be the same with any 2 zebrasoma tangs though. In the zebrasomma family the Gems and Purples are definitely the most aggressive in my experience (3.5 decades). Purples have a tendency to be long term established fish and then after years of chilling get a sudden growth spurt and as they all of a sudden start outgrowing the other tangs - Go all Gangsta on the smaller tangs.
Gems on the other hand are usually a little more 'fiesty' in general. While they are not as agressive in their attacks as purples, they will be alot more active at close range nips at other tangs.
First off - If you don't have any other zebrasomma proceed with extreme caution - if you have the ability to quickly remove the least favorite fish and house it safely till it recuperates.
Get a few other zebrasomas, scopas or sailfins, yellows (if Biota sizes are comparable) and give them more than just each other to chase after. The more fish you have, the more chaos, the less aggression.
When you get the Gem, get it slightly (just slightly) smaller than the purple - because usually they will be the aggressor.
If you are just getting started with your tank, as you posted, then stock the tank with everyone else and get the most amount of distraction and chaos before adding the Gem. The distraction of other fish - so they don't focus on just each other - is going to be super important.
Dave B
added two blue hippos about 2-3 inches a few days ago, purple almost killed both. Had to sell the purple tangIve got a purple thats about 5 or so inches. He is kind of a bully but I added a small bristletooth tang and he chased her for a little but now they are good. Never had a gem but my purple is for sure king of the tank and that went well. I also have lots of nori clips too
Oh well if thats the case I wouldnt add the gem… both are aggressive. Guess I got a very tame purple. I hear stories like that all the time. If my purple was that aggressive I would not be adding another tang to be honest, especially since gems are expensive and as are purples. They could kill eachother. But thats just my gut feeling on that, I dont have a gem and my purple is not psycho either, he hasnt actually hurt any small fish I have added after him and the baby blue and baby kole are completely chill with himadded two blue hippos about 2-3 inches a few days ago, purple almost killed both. Had to sell the purple tang