Hello! I read an article about the effects of Colloidal silver on fish 16 inches or less in reguards to scale health and healing injuries. I read the levels reguarding toxicity and it had to be quite high, so I figured if I added a capful to my 25 gal tank it wouldn't be a danger. That was 2 days ago and I have noticed that my fish are all quite vibrant now. My Blackskirt tetra is much darker then he was before, my Guppy is a deep purple and brilliant peach, and my danio's are heavily patterned now. Has anybody else tried doing this???