Good ways to get algea out of my sandbed?

what you have is detrious. (sp)  It's common for new tanks, I still have some myself.  This is where pods work well.  I know you can buy some, but I've never talked to anyone about it.

 

What you have is the beginnings of cynobacteria, try increasing the flow making sure the temp stays closer to 76 and watch your water parameters

 

Yeah, sounds like either diatoms or the start of cyanobacteria.......... diatoms are a nice brown color, the cyano will start to make almost a film of slimey looking redish-brown gunk over your sand bed where the flow is low. Like Glaspie said make sure your parameters are good and increase flow. If it's diatoms, which is common in a new tank, it will disappear as the tank stabilizes and parameters get to be where they should be.

 

syphoning it will remove it, but it will probably just come back if you dont take care of the source. Have you been using RO/DI water?

 

Every new tank will go through this cycle. If you have good flow and good water parameters it will go over away with time. Using RODI water with 0 TDS is definitely gonna help keep algae blooms at bay.