A guy at my local store shined a UV flashlight (black light) on several Veevus threads I was looking at, showing me which materials light up more than the others. Fluoro orange was the brightest, yellow, white followed. I wound up picking up thread and dubbing that was brighter in UV light because he said this was all I needed. What will happen to these nymphs underwater? Will they be brighter than my brown and olive perdigons? They are certainly brighter when I shine the UV light on them, but I can't imagine sunlight will light these up 1-4 feet under water like the UV light does. Thanks.