You spent 160$

wow, you could have done DIY co2 much cheaper you know. Ya it does cut down on algae sometimes, depends on the plants and how many. My plants grow so fast with co2, I have to trim plants weekly it's so sweet, I love the planted tank thing, especially hornwort, I have over 2.5 foot strand along with another foot strand. If you want to see your plants grow faster get some tetra florapride, cheap and I see a great growth in plants in it, with faster growers not crypts though. Sorry to intrude rajs, maybe this will be of some help to you too. I know plants that I have that I LOVE are hornwort, crypts, anarchis, rotala, most do best in high light but will grow in low light just slower. Rotala is great looking too.