SHERIDAN — Dan Hodnett sells brilliantly colored exotic fish from a nondescript building that doesn’t look special at all.

From the outside, no one would ever guess at the tiny worlds of wonder that await inside — 478 of them, each filled with a different species offreshwater tropical fish.

The aquariums are all fed fresh river water around the clock, and a team of biologists monitor each and every one of the inhabitants, alert to any signs that these fish are not going to live happily ever after.

The aquariums are all part of an unorthodox fish-selling business that has its origins in a 5-year-old’s hobby.

That’s how old Hodnett was when he first laid eyes on a tankful of glowing, freshwater tropical fish called cardinal tetras.

“I walked into a pet store and saw this tank of glowing

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