Holy Planaria Batman!

[dhnguyen]

Personally if this was my tank I would suction out as many of those suckers as I can and catch and remove all my livestock and nuke the tank with Flatworm Exit. Then do a 100% water change and then run carbon, repeat at least 3 times before reintroducing tank inhabitants. Then I would add a yellow corris wrasse or 2. I realize it's not so easy to do the above if you have a large system however.

 

[kiran]

Thanks. I just discovered a new phobia.

 

[Rmckoy]

I did notice they were gone now. .
But this could explain where the cyano and gha is coming from ?

good thing I have a bag of carbon in my sump

 

[TheShrimpNibbler]

I remember when I had a breakout of acole flatworms. Nothing near this level and mine weren’t photosynthetic, so they all died off during a fallow period. When I first saw a couple of them I thought “lemme cut him in half, that’ll take care of it.” Two new flatworms crawled off in opposite directions. This is just crazy though.

 

[The Opinionated Reefer]

I would break the tank down and start again. Bleach the tank, all new rock and sand imo.

 

[DE FISH]

One word…….. WOW!

 

[The Opinionated Reefer]

I have those flatworms and they have survived 3 doses of flatworm exit at 3 times the recommended dose. Does anything actually work in this hobby or is it all just snake oil.

 

[dhnguyen]

I have those flatworms and they have survived 3 doses of flatworm exit at 3 times the recommended dose. Does anything actually work in this hobby or is it all just snake oil.

a yellow coris wrasse will eat them.

 

[vetteguy53081]

There may be an egg or two in there. . . lol
My fear is not the flatworms which can be siphoned or Blasted with Salifert Flatworm exit
Its the eggs that the wrasses or chemicals will not touch and emerge into new ones. Based on that. I would Pull all the rock and scrub the entire surface to rid of eggs which are micro-tiny

 

[Nano sapiens]

Very likely Convolutriloba retrogemma. Back in the days of Indo live rock, blooms of these were very common in new tanks (my old 55g from 20+ years back looked just like this around the 3rd month). They are basically self-limiting and die out over time (typically a few months). To help reduce the blooms and reduce the tank stress from toxins before they die, one can shine a light from one side (where they will congregate) and then they can be easily siphoned out.

No need for chemicals.