Bottom feeders will be ok with the missed bloodworms on the floor of the tank. The fish shouldn't get them all, and if they do, try thawing them in a cup of tank water first, then pour some on one end of the tank, when the fish go crazy over there, pour the rest on the other end of the tank.
As for feeding them every 2 days, I would cut this back to once a week at most. Freeze dried and frozen bloodworms can cause digestive blockages in a lot of different fish, which has a real potential to cause them to die. They swell up similar to dropsy and die. Bloodworms should be used as a treat, not a staple. Not to mention that sometimes parasites can be passed from frozen. There are some better brands out there that people have had good luck with, but, limiting these to a treat is best.
For feeding protein to bottom feeders, like stated use a sinking shrimp pellet. Some fish will scavenge the bottom for them, but any pleco worth its weight will run them off if it is hungry enough. Use pleco wafers too. More than just plecos eat and benefit from these.