Glo light tetras

Forget the inch per gallon rule. There are too many factors not accounted for in that old wives tale. A few of which are:

Is/are the species:

-High DO riverine species or low DO lake/pond species?
-Active species or sedentary species?
-Tall species or wide species body type?
-High metabolism or low metabolism species?
-Frequent/constant feeder or occassional/opportunistic feeder?

And, is the aquarium:

-Low and wide footprint or tall and small footprint?
-Mechanical filtration or biological filtration?
-Frequent maintenance or occassional maintenance?
-Fine substrate or coarse substrate or bare-bottom?
-Low, average, or high tropical temp.

There's much more but, you should have the idea now that that old formula no longer fits the fishkeeping hobby as it pertains to proper husbandry of the diversity of fish species available in the hobby.

To answer the other part of your question; yes, it would be cool. I set my parents 500gallon black-back tank with black gravel and dark hickory driftwood. The tank had a W/D with 75 gals of bio media and cycled the tank 2.25 times per hour with flow reduced with a slice-lip return (long wide slotted return nozzle). The tank was planted with low-light anubias and java ferns. The fish consisted of 300 cardinal tetras, 24 kuhli loaches, and 50 harlequin rasboras.
The tank looked like living glitter.

I'm not sure if my parents were able to salvage any pics. Their condo building collapsed during the Loma Prieta earthquake in 1989. They lost most of their belongings in the collapse.