Threadfin Cardinalfish questions

CoralClasher · May 26, 2020

First question is it ok to use ionic copper on them in QT?

Second question I here they do best in groups so I ordered 7. Will using two ten gallon QT be ok or should I setup a 55 gallon QT just to keep them all together? I have QT’d several fish now with good results and I would rather use two ten gallon tanks but I do have an empty 55 if it would be better to keep them all together.

Kyle T. · May 26, 2020

Not sure about the copper so I’ll have someone that does answer that.

As far as using two separate QTs vs one larger I would say that either method will be fine so long as they are all added to the display at the same time. As long as you are able to keep up with parameters in the smaller tanks with 3-4 fish you’ll be fine.

CoralClasher · May 26, 2020

Kyle T. said:
Not sure about the copper so I’ll have someone that does answer that.

As far as using two separate QTs vs one larger I would say that either method will be fine so long as they are all added to the display at the same time. As long as you are able to keep up with parameters in the smaller tanks with 3-4 fish you’ll be fine.

Yeah I have been planning this for a while and I have some sponges in my refugium for two weeks now. The 55 gallon I have is kind of hard to see because it’s in the closet under my RODI filters. Thanks for your input I will add them all at the same time to DT if they make it two weeks with copper.

jsvand5 · May 26, 2020

They are fine with copper and pretty hardy once established. I’d order 10 if you want 7 though. They don’t ship well. Mine still started picking each other off eventually though like most cardinals seem to. Took about 18 months then I suddenly started finding one shredded every few days until I was eventually down to one. Started with 12. This was in a 210g tank

CoralClasher · May 26, 2020

jsvand5 said:
They are fine with copper and pretty hardy once established. I’d order 10 if you want 7 though. They don’t ship well. Mine still started picking each other off eventually though like most cardinals seem to. Took about 18 months then I suddenly started finding one shredded every few days until I was eventually down to one. Started with 12. This was in a 210g tank

I would be fine if 5 make it. I thought they did good in groups?

jsvand5 · May 26, 2020

Jon Malkerson said:
I would be fine if 5 make it. I thought they did good in groups?

They do for a while. Doesn’t last forever though. I used to think they did well in groups too. Then I suddenly learned otherwise. The only cardinal I know of that doesn’t end up getting aggressive with each other eventually are the red spots but they seem to be nearly impossible to keep alive longterm.