flatworm control in reef tank

LPS, SPS and all coral chat
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lexicon
Posts: 4
Joined: Thu Oct 10, 2024 2:26 pm

flatworm control in reef tank

Post by lexicon »

Noticed a bunch of flatworms on my Zoanthids today. They're spreading fast and I'm worried they'll mess with my other corals. Anyone got a solid way to cut it without nuking the tank? Running a 75g with mixed LPS and SPS, 2 clowns, and a clean-up crew.
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stormyok
Posts: 12
Joined: Thu Oct 10, 2024 8:47 pm

Re: flatworm control in reef tank

Post by stormyok »

Had the same issue last month. Flatworm Exit worked for me, but you gotta siphon out as many as possible first. Also, keep an eye on your parameters after treatment, it can get sketchy if you don't.
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Dodge
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Joined: Thu Oct 10, 2024 4:08 am

Re: flatworm control in reef tank

Post by Dodge »

Flatworm Exit is solid, but you need to follow the dosing exactly. Overdo it and you'll crash the tank. I'd also add a wrasse like a Six Line or Melanurus, they'll pick at the leftovers.
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coral9x
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Joined: Thu Oct 10, 2024 4:54 am

Re: flatworm control in reef tank

Post by coral9x »

stormyok wrote: ↑Sun Jun 29, 2025 3:42 pm Had the same issue last month. Flatworm Exit worked for me, but you gotta siphon out as many as possible first. Also, keep an eye on your parameters after treatment, it can get sketchy if you don't.
Yep, siphoning is key. I used a turkey baster to blast them off the rocks before treating. Saved me a lot of hassle.
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Veltor
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Joined: Sun Feb 20, 2022 11:04 am

Re: flatworm control in reef tank

Post by Veltor »

Agree with the wrasse suggestion. My Melanurus wiped out my flatworm problem in a week. Just make sure your tank's big enough for one, they need space to roam.
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graspit
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Joined: Thu Oct 10, 2024 5:45 pm

Re: flatworm control in reef tank

Post by graspit »

If you're gonna use Flatworm Exit, have carbon ready to toss in after. The toxins from dying flatworms can freak out your fish. Happened to my buddy's tank, wasn't pretty.
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tamer
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Joined: Thu Oct 10, 2024 2:09 pm

Re: flatworm control in reef tank

Post by tamer »

I've heard mixed things about Flatworm Exit. Some say it's chill, others say it's risky. Maybe try manual removal first? Less chance of a crash.
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microvolt
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Joined: Fri May 06, 2022 8:39 pm

Re: flatworm control in reef tank

Post by microvolt »

What's the best way to siphon them out? I've got a small tank, 30g, and don't wanna mess with chemicals if I can avoid it.
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lexicon
Posts: 4
Joined: Thu Oct 10, 2024 2:26 pm

Re: flatworm control in reef tank

Post by lexicon »

Thanks for the tips, everyone. Gonna try siphoning first and maybe grab a wrasse if that doesn't cut it. Appreciate the help.
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stormyok
Posts: 12
Joined: Thu Oct 10, 2024 8:47 pm

Re: flatworm control in reef tank

Post by stormyok »

microvolt wrote: ↑Sun Jun 29, 2025 9:25 pm What's the best way to siphon them out? I've got a small tank, 30g, and don't wanna mess with chemicals if I can avoid it.
Use a small hose and a bucket. Just hover over the flatworms and they'll get sucked right up. Easy peasy.
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