These work well. I have caught grayling from 8-21 inchen on one and never deep hooked one.
also small spinners with grub tails work well as do lead head jigs. Thay can be cast and retrieved or jigged with success. You can also use the jig under a bobber.
also, with ultralight spin tackle, you can assemble a fishable nymphing rig. Using one of those bobbers that you can partially fill with water gives you some weight to cast and becomes your strike indicator. From there you assemble a typical nymph rig with shot above a tippet knot and 10-14" to the nymph. Line control is tricky.
Or you could do a rig where the weight is on the end of your line and about 12-18" above you tie in a leader with a nymph on it. I forget the name of this rig but it works for nymphing with spinning gear.