Red/Green slime growing on sand

I wish I had a picture to show, Hopefully I can put one up soon. But I have like red and green slime like growing on my sand, and almost like its growing straight up off the ground from air being trapped under neith. What causes this, and how can I get rid of it. I have red slime remover, but doesnt seem to work, or im not using it enough

 

Can you get a picture? When I had red slime I vacuumed it up with a gravel val & removed chinks of algae with a bit of sand sticking to it.

 

Algae problems are usually caused by aquarium water with excess nutrients like phosphate, nitrates etc. You can try and siphon out what you can to remove the algae in the short term. In the long term you may have to examine how you care for your tank. There are some commercial dry foods also contain excess nutrients and other undesirable things like nitrates, phosphates etc so I strain/rinse my fresh/frozen foods before feeding my tank. You may want to consider feeding your fish less often. Also using RO/DI water and a high quality salt with little if any NO3, phosphates etc like Tropic Marin will really help too. Adding a phosphate remover and increasing flow in your tank may help too.

 

Increased flow is slime algaes worst enemy. Add some more flow or adjust your flow to hit the problem areas and you will be set.