Any iridescent shark experts?

[Karl K]

Understood No need to repeat but, indeed, I've made a mistake by stepping on your foot (and many feet of others) before . Just trying to be more cautious now. So I said "my opinion".

You havent stepped on my foot, no need to "my opinion"
Definetly agree with you, on the minimum tanksize Just a quick question, how do you build a 18'x9' pond ? Concrete?, wood?

 

[thebiggerthebetter]

That's a question for the "DIY" section. Rubber liner. The structure can be built of anything or be an inflatable or hard-wall above ground pool.

 

[2songbirds]

I've 2 larger ID sharks....coming from experience, a tank this size is too small (your 150). They will be scared easily, knock themselves out and possibly die (my then 8 yr old and I watched this happen firsthandedly). The 2 sharks I've had for the last several years , I got as babies andthey still scare easily.