Crazy story but this is what happened to me and completely ridded my tank of every bad thing in it:
- I had a huge infestation of flat worms. Blankets of them everywhere. And I mean blankets - if disturbed with a turkey baster, sheets of the things would float around.
I also had horrible cyano and vermetid snails up the wazoo. Oh god did my tank suck for a while!
Anyway... I ended up dumping an entire container of chemiclean into the tank on accident. The next thing I know, clouds of red planaria flatforms are snowstorming in my tank. Ever experienced a white out in a snow storm? This was like a pink-out! I couldn't see the back wall of the tank! Unbeknown to me, the concentration of chemiclean in a full container is stronger than garlic milkshake and apparently kills red planaria faster than a one-legged man in a butt-kicking competition
For unitiated, red planaria flatworms release a toxin when they die... the same toxin that is in all deadly sea creatures! For example - the same toxin blue ring octopuses etc contain - of which there is no known cure. If you get poisoned, you tough it out and let your body metabolize it. It's the only way to survive, if you survive at all. Deadly stuff... Yeah! Those little pink flecks of paint in your tank are deadly jerks!
Anyway as soon as I see this all happening, I freak out, add a boatload of carbon, and start preparing new salt water. I took the container off the skimmer, and just let that **** overflow. Chemiclean makes your skimmer overflow, but you should have seen the color! The foam, was red! Like the goo that comes out slurpy machine! Ffffff! I think to myself. I couldn't just let that red **** back into the tank water, so I start trying to scoop pink foam out of the sump by hand into a bucket. It just continued and continued foaming, red, deadly, nasty ****. Also - this toxin has a real peculiar smell. If you've ever tried killing off flatworms before with say, Flatworm exit, it smells, of like 'sour death' - that's the only way i can describe it. My entire apartment smelled like this nasty ****!
Anyway, as soon as the flatworms start flying around the tank, fish disappear into the rockword immediately and all the corals get super ticked off and go awol. It was freaking scary!
As soon as i got my new salt water up to temperature i start replacing that death water. It's about midnight when I finish and decide to just wait and see.
The next morning, 2 tangs are dead, one adult powder blue and one yellow, despite using 2 reactors full of carbon, as well a giant penguin hob filter, packed to the brim with carbon as well... plus a 40 gallon water change... It did little to purifiy the tank. Red planaria toxin is no joke, folks.
Anyway - time goes by, and I notice that there are no longer ANY flatworms in the tank, but there are also no cyano, and no living vermetids in the tank. Well, at least something good came of this, i think to myself.
All in all, this cost me 2 prized tangs, a container of chemiclean, boatloads of carbon, my pride for screwing up the dosing for chemiclean, and my nerves for having to deal with this ordeal. Tossing all of that aside, i have to look to the bright side. What I gained was a cyano, flatworm, and a vermetid free tank. I haven't had so much as a single sign of any of these issues since then.