red stuff on sand, small "bubbles" on rocks

[Milad]

so i got this red stuff on the sand in a very high flow area of my tank. is it cayno? It disappears when the MH go off but actinic are on. doesnt really look bad to me, kinda looks like coraline growing on my sand, hehehe.

i also go this one low flow area, and about a quarter size area on a rock has these small mini bubbles, probably a good hundred or so. what is that? bad? good? run for my life?

should i be worrying? should i combat these two things?

this stuff started showing up when i started dosing coral snow, coral vitlizer, zeobac, and sponge power.