Large red blobs in tank (pic)

Could be a mushroom.. wait and see? Even if its red slime, its not going to hurt to wait a bit. ( ck your phosphate & nitrate lvls if you suspect slime)
 
Botrycladia. It is a red bubble algae. It is in my opinion quicker spreading than Valonia. Most tangs will quickly consume it, something I reccomend as it is pretty invasive. Manual removal is near impossible as they are easily popped and a gel like substance is then released into the tank.
 
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