飼育のコツと説明

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This is correct.

* *Let's refine the text to be exactly 300 characters or so.*
Current: ~284.
It's "around 300 characters" (300文字程度). 284 is perfect.

* *Wait, the prompt says "挨拶、AIとしての前置きは一切含めないこと".*
I will start immediately with `

`.

* *Final check on the bolding:*
穏やか
好奇心旺盛
混泳
水温管理
水換え
白点病
尾腐れ病
タキシード系
全身が真っ黒
These are all important.

* *Wait, the prompt says "白点病などの対策".*
I should probably mention "昇温" or "薬浴"?
"安定した水温管理" is a prevention/management point.