The worst aquarium experience of my life was after using an algaecide in it. The rule holds true for aquariums as well: if you have an algae problem, you have another problem and using an algaecide just covers it and the ramifications of killing the algae are often worse than the original problem. Algaecides have only one recommended use IMO: in ornamental fountains with no plants/fish, and then really, BLEACH is better. Throw that algaecide shit in the trash where it belongs.
I have NEVER used alagecide in my aquariums, because, for some strange reason, with dosing co2, a full spectrum light, and everything possible, I have never gotten green water in my tanks, only string/hair algae, wich is quite normal, just unsightly. and now, after spending a serius 100 dollars on a uv light, after a week of usage, my pond stays clear on it own now ughhh, but also yay! now my pond just goes through cycles, about onces a week for a couple of days it turns green, and then bam clear again, so really yup, benifical bacteria is the best it gets