Oh yeah I will never do h2o2 again I killed 5 tetras by trying that method for my last bout of the algae I had, I just don't want to kill my fish, (I have to restock due to I didn't know about microbubble disease and killed both my sentani rainbows from a water change with microbubbles) wanted to quit the hobby after that, so I'll try it but I don't want to go crazy, what would be a good safe amount for a worry wart like me?
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If you are just looking for the plant carbon supplemental action, then just use Seachem's or NilocG's recommendations, depending upon if you are using Excel or Enhance, respectively. Those recommendations are well into the safe zone.
API also makes a product just for algae, called "AlgaeFix." It works, but it can be tricky as well because it can heavily stress fish and some may succumb. If you decide to try that, the stress can be reduced by dividing doses up into smaller doses with a few hours between each, which gives fish time to adapt. This doesn't seem to change its effectiveness on algae. Also, increase oxygen. I prefer my glut annihilator technique of all the options simply because I've never lost anything to it and it does destroy all hair algae once the right dose is found. If you try it, start with .5 ml /gal only because your pH is above 7. If it doesn't totally eliminate the hair algae, go up in .25 increments each week until you find the sweet spot for your tank. These are only temporary fixes until you get your plants in condition to beat back the algae.