Unknown Algea

[KellyB]

I have noticed over the last few says some new colores showing uin my tank. Sorry that the pictures are not any better. The first picture there is a rwather bright red spot growing on my rock. The second is of the sand and the green and rust color growing on it, I would reallt like to have wgite sand instead of the colores growing on it because I doubt that they are good omens. And the third pucture is of a dark dark purpke it is hard and doesnt break off abd it looks like it is growing my snails or crabs dont seem to be doing anything to it.
Anyone have any ideas if these are ok or not abd how I might get rid of them.
I have a 34 gallon tank established for 3 months

 

[wuuzzzuuppp]

The red stuff looks like cyanobacteria aka Red slime algae

Here's a link on nuisance algae and somewhat how to deal with them

Nuisance Algae ID Guide

 

[wuuzzzuuppp]

The Dark purple if I'm looking at the same thing looks like coralline algae which is good. Unless you are talking about the big black looking spot about dead center of the picture.

 

[KellyB]

The Dark purple if I'm looking at the same thing looks like coralline algae which is good. Unless you are talking about the big black looking spot about dead center of the picture.

The black looking stuff, it actually is dark dark purple, but I do have coralline algae growing nearby.

 

[wuuzzzuuppp]

You said the dark dark purple is hard and wont scrape off?

What are your your parameters at........ph, nitrates, alkalinity, and phosphates?