Thank you all so much for helping me.Fuzzy Chitons. They are slow but good grief they clean. They don’t discriminate what they eat once the get started so dinos and cyan and anything else get munched. They exclusively clean rock so you won’t have them constantly on the glass either. So the won’t likely eat your dragon’s breath.
Turbo snails as mentioned.
An orange lipped conch stays small enough to live in a 20 high and will help your sand bed a lot.
For a small tank, Hector’s goby or rainfordi (court jester Goby) will eat it when it’s longer. Once it’s short they pick at it but will move to sifting out of your sand bed mostly which helps with nutrient export and still helps control algae. They might pick at your macro algae as will any algae eating fish or crab but probably won’t consume it. I have chaeto in my tank in case I don’t have enough algae for my lettuce nudibranch. And both of the above mentioned animals mess with it except the nudibranch during periods of low algae.
Lettuce Nudibranch: I was so amazed with my first one because it literally climbed waving algae and tamed it. Once the long stuff was gone, it moved to the glass, wouldn’t eat the chaeto and finally vanished. The second one did a great job on the rock until it found the chaeto ball. My guess would be that your dargon’s breath would not survive a lettuce nudi.
Nassarius snails to clean up detritus in your sand to aid with nutrient export.
Copepods and amphipods.
If you want to add “fun” CUC, micro brittle stars will clean up extra food like crazy as will cleaner shrimp.