Originally Posted by gleem

Yep, same thing happened to me last year with my tank, after 5 years all of a sudden my whole tank became a hair algae mess, started to hate it, did weekly water changes, tried some new equipment, was very close to quitting and selling it all.

Then my RO/DI filter was giving me problems so I went to the grocery store and bough 30 gallons of Zephyr Hills DRINKING water (this is their highly filtered 0 TDS water not to be confused with "spring water".) and after doing no water changes and only using the bottle water, a month later all the algae was gone! ALL OF IT!

Even though my RO/DI system was putting out ZERO TDS on every meter I could find to test it, it was causing non stop algae blooms. Everytime I changed the water, added top off water I was just making it worse.

So now my tank is free of algae and I haven't changed the water in 3 months. Happy tank owner again, everything is thriving!