Sorry I haven't put any descriptions for my tanks yet (I will get to it soon). Anyway I have a 40 gal. Puffer tank with 3 Green spotted puffers (GSP) and one porcupine puffer. I converted to GSP to salt water almost a year ago and added the porcupine after, they are all doing great, only problem is I recently started getting long green hair algae (prolly from over feeding and not keeping up 100 percent with cleaning, and the number one sin in algae control.. Using tap water for top offs). I've got it mostly under control now but, I'm wondering if there is anything I could at to the tank that would eat the algae but not be eaten by my puffers? Thanks for any help