Ok thanks for info! Before I treat thought I give my full story! My dad has always had tanks when I was growing up and still does, so bout 30 years of keeping fish! So been something I've always been interested in! Lil over a year ago my dad helped me get a 29 gallon up and running! We added some angels and a Pleco! After bout 2-3 months they started getting that rusty tint to top part of body, I was worried called dad, had him come over to look, he thought they were ok, so I never really worried bout it! Then 3-4 months ago pair my angels been laying eggs and fertilizing them bout every 15 days! Bout 6 months ago we decided we wanted to expand and got a 55 gallon tank, dad told me when I set it up, that when I do a WC on my 29 gallon put 5 gallons of dirty water out of it into 55 gallon to help cycle process(which now I'm thinking I infected 55 gallon! But not thinking of it at the time slowly added some platy's, dwarf Gourami's, and Dalmatian Mollies! Then about a week ago notice one of the mollies started getting that rusty tint on some of its fins! This made me start worrying again! I do 20% WC on both tanks every 2 weeks! I don't have my aquarium log on me right now to give specific numbers, but in my area we have high hardness water and higher ph levels! Ask guy at LFS said that wouldn't worry bout said today fish adapt well to deferent water parameters! So thoughts? Like to get this taking care of if it is velvet! Looking forward to trying to get some successful babies from my mated pair sometime! Thanks