green algae

bout a week ago my rocks were covered in a brown slime. was told its cause its a new tank and still cycling. LFS told me to turn lights off for a couple of days and reduce my lighting time. which i did. i have a cannister filter rated for 70 gal tank, skimmer rated for 100gal tank and like some sorta 1400 pwrhead the LFS said would b the only 1 i would need. i have a 55 gal tank. i had bought a coral bueaty angle and a yellow eye tang so i bought freeze dried seedweed to feed them. none of my fish went after it so i took it out and havent used it since. like a day or 2 green algae came from no where. i have 5 small snails in atm. im useing ri/do water so i should have no phaspates. the wife cleans the glass every day and glass gets cover again within a day. what type of snails and how many would help me clean this tank up? if i need to buy more and some die im kool with that cause of the hermit crabs i have homes . my nitrates and nitrites are in the middle. ive been useing stuff to help with bring them down so i dont see a problem there. now i may be or for sure feeding my fish to much but my fish eat most of it so i feed alittle more for the crabs and shrimp i have. and input would b nice b4 i go buy stuff to fix the problem. im going to use live stuff and no solutions to fix it cause tank hasnt been up for 6 months to a year. would emerald crabs help?

 

firt and formost how long has the tank been set up?

 

a couple of weeks and all my testing im doing just a few minutes ago telling me im good. nitrites a little high but not 2 bad and nitrates pretty low.

 

ITcould be a number of things if I could get an intemidate detailed list of your current readings and you feeding habits along with your husbandry haabits that might help.

 

ammonia 0, nitrites .25 ppm, nitrates 5 ppm

 

You shouldn't have any nitrites, your cycle either isn't done or you caused another one by adding fish too soon.