I think you've made the right choice for the fish..to rehome him would not be ideal.
I have the same dilema...I bought a Kole Tang when I first started my first tank...it's a 65g hex...so it's 24" across.....and he seems very happy, healthy and small. Might not have been ideal.....but he's happy and that's all that counts!
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No act of kindness, no matter how small, is ever wasted.
Sarah
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