Green Hair algae eaters!!!!!

weell lets see i ran my tank for a month and a half with nothing and i tested water and its good but now ive got a timer and now it should start slowing down.

 

Not to change the subject but what is GFO and GAC??

 

Granular Ferric Oxide
Granular Activated Carbon

 

ya also if your ph and alkalinity are to high or low that can give gh a chance to expand also manually taking the gh of witha tooth brush works fantastically then your snails can eat the small stuff with ease. i also had a sea hare and it didnt do much or couldnt keep up with it. also make sure ph and alkalinity are ok because if not your crabs and shrimp will die i lost 3 peppermint shrimp,coral banded shrimp,cleaner shrimp, 2 emerald crabs in a matter of 2 weeks because those two things were out of wack

 

test your ph and alkalinity

 

I would suggest checking for phoshpates.. like they said it is an underlying issue.
Most people point quickly at tap water but that doesnt necessarily have to be the issue.
Depends on tap in your area. My tap is quite clean. I have used tap in all of my tanks with just dechlor.. I also do not do water changes unless its a necessity.
I have never had GHA except for a tiny bit on my pumps and things that cuc's could not get to. That was in my 37 which I had little to no CUC (learned my lesson though lol b/c I did have cyano eventually from feeding too much and no cuc). My 125 has had no algae issues at all.