I prefer size 6 chartreuse and white Clousers follow been a close second by size 6 chartreuse and white clouser LOL. But in all actuality sandbass will hit anything that they can get in their mouth with one key factor presentation. I have seen days where they will only hit it coming down stream I've seen it only across current I have seen it when they will only eat if it's going upstream and their other day if you need to mend and just keep it right in front of their face until they eat it.
notice it is still tied on that's what three hard days will do to a fly during the Sam Bass run I used it for another three just like that and caught fish every cast. It was one of those places there were not many flyfishing guys and guys would ask what I was using I said you can come look at it but you won't believe it. They had just about chewed my fingers to the bone at that point taking them off the hook. Also never underestimate using a indicator and a nymph as those fish as babies remember eating now growing up.