just wonderd if anyone else as been troubled with , well its like a fluresent green
colour
sitting on the sand substrate at the front of the tank
it looks like a shower of what i'd call paint powder, it does'nt look like any algea i've ever seen
we used the aqua vac and removed it then replaced the sand that had been taken out with it, any info on what it could be and how to remove it for good
would be much appreciated 
colour

