IMO, I'd skip adding 2 neon gobies. One eventually harasses the other and kills it. I wouldn't try 2 in anything less than a 6 foot tank and even thats not a guarantee. I had 2 in my 90 and one harassed the other all the time until there was just the one.
Also the scooter might only be interested in pods and sand fauna which your diamond goby is also interested in. Even if the diamond is already eating prepared foods, he's likely still sifting so you'll definitely see some competition for sand fauna there and the scooter likely won't win as the diamond gobies are much more aggressive about sifting sand. Scooters are neat fish to watch but man are they're not the swiftest when it comes to food.
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