It will be fine...they will shoal and live together. Hoever, I'd highly discourage you to get more. They are tankbusters....literally. Not only do they get 3-4 feet long but het heavy enough to bust open a glass tank of they're startled. Please do some homework on them
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Yes, I am aware, even when I got them, that I cannot keep them forever due to housing requirements. Also them turning solitary when older. I was under the very wrong impression that a 300 gallon tank would be adequate to keep a single iridescent. Now I am pretty sure that nothing but a large pond will do.
I am looking for alternatives, but come up empty so far. Unfortunately ID sharks are quiet unique, and the close siblings are even bigger that cannot be housed in public aquaria. At least in the US, not sure about worldwide. What I love about them is this:
- great body shape (closely resembles a real marine shark)
- likes to be in a shoal (at least in my tank before they grow too big)
- non aggressive for peaceful community tank
- very active swimmers (more so at night, but mine also like to come out during the day every now and then)
If I could find something like that in a catfish that grows to about 8-12 inches max, I would be happy. The closest to that size in not aggressive is the raphael cat, unfortunately solitary. Then there is pictus cats, which are a little on the smaller side (for my like) - but I will seriously consider them since they shoal - maybe I get lucky and end up with some that will grow past their usual 4".
Any other suggestions for alternatives that I am overlooking? Oh, one non-negotiable requirement is compatibilty with my clown loaches - those are the dearest of my fish.