Threadfin Cardinalfish (How Many Should I Get?)

[CoralNerd]

Blue Streak Cardinal (Zoramia leptacantha)

I currently have the following fish:
1) Purple Firefish
2) Yasha Goby
3) Yellow Corris Wrasse
4) Yellow Corris Wrasse
5) Ignitus Anthias
6) Zebra Barred Dartfish
7) Tailspot Blenny
8) Tanaka's Pygmy Wrasse
9) To add McCosker's Flasher Wrasse
So 9 fish total.
Right now my system is so clean I need to add some more fish so I will have more nutrients. I feed a decent amount live and different flake food. I turned my GFO reactor off recently and I still only have .19 phosphates. Skimmer has been turned to dry skimming. I have a nice skimmer and nice sump with refugium. It's about 85g to 90g 46" x 20"

So how many threadfin cardinalfish should I get? I'm thinking 4

 

[Shep]

Don't know much about them, I think tank space you should be ok but temperament is a different story. Are these fish aggressive or territorial at all?

 

[CoralNerd]

Not aggressive at all. They shoal kind of like schooling and are about 2.5" to 3".

 

[jcosta26]

Cardinal fish look good in schools of 5-6 and you tank should be able to handle it

 

[bigdrew]

Reviving an old thread here. Thinking about adding a school of 7 of these guys. @CoralNerd how did this work out? I have a 64 gallon custom cube.

I have only three fish in my tank: a tomini, the African flameback and a flame hawk.

Thanks in advance for any advice/perspective! These 7 are my last fish that I’ll add.