algae identification

Hi all, I have 65g Red Sea Max 250 and I am new to this hobby. I've had my tank for 4 months now and have slowly introduced a few fish and invertebrates. Just recently, I noticed this Algae? growing on the substrate. I have been vacuuming the substrate quiet frequently, which has resulted in a...

I purchased a complete, cycled aquarium about 5 months ago on Craigslist and about 2 months ago I started getting a brown algae on the sandbed, looked like diatoms. When I moved the tank, I threw away the old sand and put in 20 lbs of caribsea arag-alive pink fiji sand. The tank had been...

I actually have two questions: What type of algae is this ? It is starting to spread but I am not sure what to do about it. It pink, translucent and fluoresces under actinics. Pic attached. Second question, after trapping 5 mantis shrimp and catching 5 urchins I am now left with a number...

Anybody know what this algae is and how to get rid of it? It's feels kind of like gelatin. Any help is appreciated. Thanks in advance, Karoo