Snails are really hit or miss. I QT everything and I always lose some there and then a couple more die in my DT. They work very slowly so you would need a lot to make a dent and they also avoid GHA once it gets long. The Group could chime in if your high Nitrates would be a problem for an Urchin. Mine is an Algae Beast and has grown since I got him. Probably worth 30 snails.
