O.K. I'm trying to be proactive intead of reactive. I'm raising Angel fish for the first time (I've been a hobbyist for 15 years). I would like to add a few clown loaches to keep the gravel clean (besides the fact that they're 1 of my favorite). My concern is that these beautiful fish are very succeptable to ich. Any ideas how I can prevent my loaches from coming down with this disease before & after I introduce them to my angelfish established aquarium? I presently have 3 angels in a 40 gal. tank. 1 nickle size & the other 2 are dime size. I also have a beautiful sm.(3 in.) snowball pleco. Thanks ahead of time.