For night fishing, a caddis dry is usually more practical than a tiny mayfly imitation because caddis patterns can be fished with a bit more silhouette and movement. The Fly Crate Foam X-Caddis and The Fly Crate Caddis Adult both fit slow water and surface presentations.
The Fly Crate Missing Link Caddis is a good choice when trout are picky and you want a pattern that can also pass as a mayfly or midge.
For night dry-fly fishing, fish slow water, seams, tailouts, and edges first.
Use a dead drift with the caddis patterns, but add a slight skate or twitch if fish are looking up for movement.
With the emerger, fish it low in the film on fine tippet and let it ride naturally.
If you’re trying to cover water at night, start with the more visible, buoyant caddis patterns before going smaller.
When to switch
Switch away from dry flies if trout are not rising and you’re really trying to fish the bottom; then a nymph, streamer, or wet fly is usually a better tool.
If you want true bottom fishing, these dry flies are the wrong category.