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#1
01-21-2009, 02:43 AM
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This advice kind of differs depending upon which type of hydroid you have but . . .
I panicked when I had them about a year ago and kalked them, changed flow, etc. all to no avail. Then I read somewhere on RC (I think it was on RC) to just let them be and eventually they'll die off. The information I read basically said that at some point in your reef's development it will have conditions perfectly suited to keep them alive and they will thrive briefly. But if you were to try to keep them alive at another point in time you would fail miserably. So I just let them be and they died off within a month never to appear again. What kind of hydroids do you have? Do you have any pics?
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SPS Dedicated 24x24x20 Trimless Tank | 20 g Sump | Bubbble King Mini 160 Protein Skimmer w/ Avast Swabbie | NP Biopellets in TLF Phosban Reactor | ATI Sunpower 6 x 24W T5HO Fixture | EcoTech Vortech MP20 | Modified Tunze Nanostream 6025 | Eheim 1260 Return Pump | GHL Profilux Standalone Doser dosing B-Ionic | Steel Frame Epoxy Coated Stand with Maple Panels embedded with Neodymium Magnets "Mens sana in corpore sano" 
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#2
01-21-2009, 05:08 AM
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i have a few small patches that haven't caused any problems but when i was joe's juicing some aptasia i gave them a squirt and it wiped out a big strip right through the middle of the patch
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but what the heck do i know
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#3
01-21-2009, 04:59 PM
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Quote:
I have had some success with taking the piece of rock out and running HOT water (boiled R/O, but I don;t see why tapwater wouldn't work as well) over the affected area. Every time I kalk, the hydroids come back like raffis cat. Been 2 weeks since I tried the boiling water method and they have not returned as of yet.
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#4
01-21-2009, 07:08 PM
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brush'em
I had a major hydoid popullation,used an old tooth brush just kept brushing them off the rock every time they appeared,soon it was less and less,havn't had any for over 3 months.Worked for me,could work for you.
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#5
01-21-2009, 07:19 PM
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Thanks for all the ideas. i have tried to brush them away on a regular basis and they kept coming back...I removed the rock and scrubbed with a stainless brush-they came back! Right now I have all my rock in my sump with no light...they appear to have receded-just not sure they are gone! I put a link on my original message that shows them-not a great pic, but I will try to find a better one.
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180g tank(6x2x2) w/170lbs LR, 2-250W 1-400W Halides, 2-3ft t5 Actinics,H&S 1260 200 Skimmer, 1-Tunze 6000stream w/controller, 1-6060stream, 70g sump, 30g refugium Neptune controller, Sequence Hammerhead inline return, Lifeguard 25W UV, 1-Tunze osmolator, 1-Tunze wavebox, 1/4Hp Pacific Coast chiller, MarineTech calcium reactor
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#6
01-22-2009, 12:13 AM
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My CopperBand Butterfly ate mine. Had a couple rocks with quite a few patches and are now all gone. I saw him picking at them a number of times so I assume he is the reason for them disappearing.
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Red Coral Online Store  www.redcoralaquarium.net 45 Gallon Cube with 10 Gallon Sump, Lighting 8 bulb T5, Vertex IN 80 Skimmer -2 Occelaris Clowns, Engineer Goby, RBTA, Peppermint Shrimp
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#7
01-27-2009, 04:05 AM
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I had a serious growth of hydroids and had tried everything to kill them with no success. One day last summer, my chiller broke and my tank went up to around 92 degrees. It killed all my sps and fish, but also killed my hydroids and they have never been back. I suggest you remove a piece of rock with hydroids from your tank and place it in a container and run the temp up to 92 degrees. It worked for me and it is worth testing on a small piece of rock.
Jim
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