no way this stuff is the best growing macro i know offi run 80 watts of zoo meds on 24/7 and i trim every 2 weeks, my pipefish loves it, there are so many critters on each bud its awesome, you will never hear anything bad about this stuff, except one thing, that it takes over the tank, which is what you want in order for your micro algae to die off...unlless you want a show macro tank with slow growing macro, but theres not many nutrients being takin out of water with the slow growing stuff, now you can take a handfull of this stuff throw it in your main tank, and guarenteed it wont be there long enough to start growing, the fish love it, expecially the tangs and gobies..and at night you can see worms in the main tank come out and eat it...its decent awesome stuff...well worth the money execially if loaded with critters and pods