Are these flatworms harmful?

Treat now, or ignore and hope they're harmless?

  • Treat

  • Ignore


Results are only viewable after voting.

shimps1

Active Member
View Badges
Joined
Jan 2, 2016
Messages
138
Reaction score
82
Rating - 0%
0   0   0
I have a 4 week old 12 gallon tank, currently finishing a cycle. I purposely chose to do a dry rock cycle with a tiny bit of live rock rubble from a local tank, to try to prevent pests. I've spent the past month building up a good bacteria base in the tank and letting it cycle.

Right now, the only occupants of the tanks are hermits, snails, a mangrove propagule, some chaeto, and these flatworms.

I am really hoping this is a harmless flatworm species or two having a population bloom, that will return to a lower equilibrium in the tank after everything gets settled in. At the same time, it's a risk leaving them in there, and now is the best time to treat for them. I do not want to let these guys get out of control, to the point that I have to use chemicals after I add corals, fish, and more invertibrates.

This is also only a 12 gallon tank, so adding a fish to control them isn't feasible.

My first fish and coral are showing up on the 8th, next Thursday. I am thinking I will do at least 3 rounds of Flatworm eXit between now and then, followed by multiple clean water changes and running carbon.

My gut tells me they're harmless, since there is nothing the in tank right now they could be eating besides detritus and copepods. If their population is exploding right now, they obviously aren't eating stuff that I want in the tank. But if they can overpopulate to the point of choking out corals, they have to go.

Any thoughts?

PXL_20260103_011417286.jpg

PXL_20260103_012133840.jpg

PXL_20260103_012152196.jpg

PXL_20260103_012225934.jpg
 
Last edited:

Tahoe61

10K Club member
View Badges
Joined
Mar 2, 2012
Messages
17,948
Reaction score
21,589
Location
AZ
Rating - 0%
0   0   0
Thoughts, hmm. The guy selling you product says they are harmless? Isn't that curious?

Did you Google Red Planaria or photosynthetic flatworms?
 
OP
OP
shimps1

shimps1

Active Member
View Badges
Joined
Jan 2, 2016
Messages
138
Reaction score
82
Rating - 0%
0   0   0
Thoughts, hmm. The guy selling you product says they are harmless? Isn't that curious?

Did you Google Red Planaria or photosynthetic flatworms?
Typo... Meant gut, fixed. No one is selling me anything.

These are not red like the Red Planaria in Google photos, they are much more brown/rusty. The photosynthetic flatworms I saw on Google are much more round than these ones.

I am leaning towards these being acoel flatworms, but I am looking for advice/experience on them in a tank, and if it is worth treating for them. I've never had a flatworm problem in a tank before.
 

Tahoe61

10K Club member
View Badges
Joined
Mar 2, 2012
Messages
17,948
Reaction score
21,589
Location
AZ
Rating - 0%
0   0   0
 
OP
OP
shimps1

shimps1

Active Member
View Badges
Joined
Jan 2, 2016
Messages
138
Reaction score
82
Rating - 0%
0   0   0
Snagged a couple better pictures today.

PXL_20260103_204334368.jpg

1409.jpg
 

braaap

Valuable Member
View Badges
Joined
Jul 16, 2015
Messages
2,480
Reaction score
2,729
Location
Montana
Rating - 100%
3   0   0
Hit or miss. Some mess with zoas/possibly eat zoas. Some don't. A wrasse or some flatworm exit will take care of them.
 

ScottJ

Valuable Member
View Badges
Joined
Aug 28, 2020
Messages
1,740
Reaction score
3,377
Location
Rochester Ny
Rating - 0%
0   0   0
If you don't have any fish or coral in the tank right now, I would kill them with extreme prejudice, wait for any eggs to hatch, then kill them again.

Show no mercy.
 

KrisReef

Last to get paid.
View Badges
Joined
May 15, 2018
Messages
22,081
Reaction score
39,129
Location
Vatican & Las Vegas Penthouse Quarters
Rating - 100%
1   0   0
I have a 4 week old 12 gallon tank, currently finishing a cycle. I purposely chose to do a dry rock cycle with a tiny bit of live rock rubble from a local tank, to try to prevent pests. I've spent the past month building up a good bacteria base in the tank and letting it cycle.

Right now, the only occupants of the tanks are hermits, snails, a mangrove propagule, some chaeto, and these flatworms.
Put the mangrove in a bucket with the chaeto (remove any flatworms as you transfer) and put a light over the bucket. Maybe bring the snails along to forage on algae?
Any thought
Without food or light, these worms should fade out and perish without chemical treatment necessary, just time. Bacteria, and I would add some pods and hope the hermits help eat these worms.

They often fade out without direct effort, but sometimes they explode and become a huge problem.
 

KrisReef

Last to get paid.
View Badges
Joined
May 15, 2018
Messages
22,081
Reaction score
39,129
Location
Vatican & Las Vegas Penthouse Quarters
Rating - 100%
1   0   0
I think these would not be happy in a KCl (potassium chloride 2 Tablespoon/gallon) dip. It might be very simple to drain the 12 gallon tank, spray some dip solution into the substrate, dip the living plants in KCl, and then rinse with a tiny bit of clean water to remove the excess KCL, and then refill and have a clean tank. IF they reappear from eggs, repeat again in a week or two, and send them all to perdition.
 

winxp_man

So Many Tanks, So Little Time
View Badges
Joined
Dec 23, 2024
Messages
1,304
Reaction score
1,305
Location
Sacramento
Rating - 100%
1   0   0
Had tons of them when my tank ran fallow because of ich. I would such some out but didn’t pay much attention to them. After putting my fish back in the DT they disappeared. I only had one angle, a bunch of tangs and a maroon clown. Have no idea who took them out. I feel all my fish eat everything. So much for my tangs being herbivores! My tangs eat my amphipods like crazy! And some of them are 1/8”!!!! At this point I have to dose amphipods for my maroon haha. It’s all she eats! I hate it!

But one fish that for sure will eat the flat worms is the melenarus wrasse.

The flat worm extermination chems can cause problems especially if you don’t have carbon going. The issue is the toxins they release when they die off in big numbers. So it depends how many you have.
 

ScottJ

Valuable Member
View Badges
Joined
Aug 28, 2020
Messages
1,740
Reaction score
3,377
Location
Rochester Ny
Rating - 0%
0   0   0
I think the key thing here is that the tank is brand new with no fish or coral in it. Easy to pull any snails and hit it with Flatworm Exit, do a full 12 gallon water change, rinse and repeat if needed. Tank is way too small to hold anything that might eat them.
 

TOP 10 Trending Threads

WHAT AMOUNT OF LIVE ROCK AND SAND SHOULD BE PRIORITIZED FOR OPTIMAL BIODIVERSITY/FILTRATION?

  • 100% live rock + bagged sand

    Votes: 34 27.6%
  • 100% dry rock + 100% live sand

    Votes: 43 35.0%
  • 50/50 live/dry rock, 50/50 live/bagged sand

    Votes: 27 22.0%
  • 75% live rock, 25% live sand

    Votes: 11 8.9%
  • 25% live rock, 75% live sand

    Votes: 8 6.5%
Back
Top