after treating my tank for ich with "Quick Cure" almost two weeks ago, i decided to replace the fish i lost from ich (the fish that died before i decided to treat my tank)... i put all my new fish i bought tonite in my tank (a sucker fish, balloon platy, and male guppy)... i figured it would be a good idea to siphon the bottom of the tank because i didnt this week, since i was too scared because of my guppy fry (i didnt want to mess with the water too much)... so just ten min. ago i siphoned a gallon (from my ten gallon tank) and after i was done i looked and there are little microscopic black things moving quickly in the bottom of the gallon... i also dont know if this has anything to do with it, but instead of seeing lots of old food, there was like a dirty cloud when i would poke the gravel with the siphon (maby i was just alge).. i also bought "Para Guard" today its a "Fish & Filter safe parasite control" so i could prevent further outbreak of ICH... i put half the does sugested in my tank (i only did half because of my guppy fry) do you think this will kill it? or is this just a preventitive? it said on the bottle to put the drops in when you add new fish(that why i put in in my tank already) could the black things be just part of ICH? because i heard it goes in cycles...i only used half the dose of "quick cure" when i had my outbreak because i didnt want to kill my fry! these black things dont seem to be effecting my fish... YET!... what is this?