looking to add a group of anthias to my tank. Tank is a Red Sea 650s about 170 gallons 62x22x24. I’m looking to keep at least 4 but no more than 6. So let’s hear suggestions and any advice you may have. Thanks in advance.
I've kept lyretails and ignitus. Both are beautiful in different ways. I love the beautiful color of the male lyretail in contrast to the females, although male lyretails can be a bit of a jerk (more females to keep with him to disperse aggression the better in my opinion). Ignitus anthias have more varied and bright coloring and are much more docile than the lyretails. Lyretail and ignitus can be mixed together without any trouble in my experience (if you want to go that route).
Lyretails are going to be a bit hardier, but both the ignitus and lyretails should eat greedily once you get them eating. Ignitus seemed to be shyer to me than lyretails. If adding to an established tank, I'm not sure how the ignitus would do. It is possible they might stay in a cave area and not come out. If adding enough of them after proper QT, though, I suspect they would come out and not stay sheltered away after introduction (ideally I'd add the anthias and all shy fish first into a tank versus last as they can be shy at first). Both lyretails and ignitus will be active in the water column. Both would do best on multiple feedings a day like all anthias, but I believe this less crucial for the lyretails and only slightly to moderately so for the ignitus.
If you choose to get some anthias, I would recommend buying a lot more than you want, as my experiences with purchasing them online is that you will lose several during the QT time period. I'd start with all female juveniles with lyretails and let them work out who will become the dominant male. I believe sexing the male versus females with ignitus is a bit harder. You may just have to get a group and hope for the best.
Your tank seems pretty heavily stocked to me given the number of tangs you have, but you can be the best judge of that than me. I just mention it because the lyretails and ignitus, while not large fish, will add quite a bit more to your bio load when you start talking about adding in a group of them.