Cyanobacteria (red slime algae) is a type of bacteria and is not even in the same kingdom as coralline. As one of the first living things in the oceans, this bacteria has branched out and there are many different species and color morphs as with coralline. Sometimes the colors can be confused. Anyway, cyano is nonencrusting and may or may not be accompanied by bubbles (released nitrogenous gases). Cyanobacteria is somewhat sheet-like. You can pull the whole thing off. Do not blow it around with a turkey baster. If the bacteria dies, it will simply release its nutrients back into the water and feed the remaining colony of cyanobacteria. Using a hose, you can vacuum it out. This will help to remove some nutrients, but in the end it comes down to fixing your water. With more frequent water changes, the addition of phosphate and/or nitrate removal media, the reduction of feedings, and a slight adjustment to your lighting and/or lighting schedule; you can beat cyanobacteria. Cyanobacteria shows no limits in its surface areas for colonization. While rigorous flow may limit the growth, it can live on powerheads, rocks, sand, glass, etc. It mostly stays in nutrient rich areas.
Coralline on the other hand is an encrusting algae. Removal of this algae is difficult in most cases. The color morphs are normally purple and pink in saltwater aquariums but range from any color on the spectrum provided the right conditions. Coralline generally does not grow on the sand, but it isn't unheard of.