HELP! i have this green alage growing on my sand and on my glass...the snails do not touch it! This just poped up about 2 days ago at first it was not to bad and then it just exploded! my skimmer sucks but it is pulling about 4-5 cups of wet skimate. my nitrates are sround 10ppm i dont know what else could be doin this....anyone have any ideas?