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Old 08-23-2017, 11:07 PM
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Zoanthids - some getting smaller, some die off - suggestions?

I started a Nuvo 20 several months back. Mixed Reef with soft corals, some SPS and some LPS.

I have around 20 different kinds of zoas all were doing great and growing quickly. Example had a 2 polyp Utter chaos within 6-8 weeks now 8 polyps.

Last couple weeks some colonies closed up, have had some die off, some have gotten smaller and some the heads are mis-shaped and look unhappy, unresponsive to touch etc.

I started using Kalk on July 1st, have never used it in 17+ years I've kept reefs, always used 2 part. I started very low dose and have been raising it slowly since July and sometimes supplementing 2 part during the week as well when I test. I am up to around 1 tsp per gallon in the ATO as of now, which loses around .25 DKH a day. There definitely have been ALk swings throughout the week since I started but usually slowly goes down during the week whereas 9.5DKH after a water change might be 8 a week later.

Other than that salinity 1.26, some carbon, ghost skimmer. I change around 5 gallons a week as its a newer tank, might go down to 3 or 4 gallons / week after tank reaches 6-8 months. 2 clownfish and a clown goby, no pests, no amphipods in the tank, no nudi's, spiders, etc. lighting AI prime (not HD) 80% power on 20K. I started the tank at 60% and raised to 80% of last 3-4 months. Out of the 20 something colonies most are zoos, some are paly's. the issues are with both.

I can't seem to figure out whats wrong, have kept reef tanks on and off for many years.

Any suggestions?
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Old 08-24-2017, 06:58 AM
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Lights

Try turning your lights down and stop dosing kalk. If you're doing weekly 25% water changes Andujar have mostly Zoas in urtabkthe kalk might be overkill. Also it's the heat of the summer. Is your tank overly hot?
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Old 08-24-2017, 06:59 AM
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And u have mostly Zoas your dosing kalk might be overkill sorry iPhone keyboard
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Old 08-24-2017, 07:24 PM
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I don't think the Kalk is overkill as I'm testing Alk, I do have some SPS and LPS. I might try turning down the lights 5% and cut down on water changes as suggested above, perhaps water "too clean" for zoas.
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Old 08-24-2017, 07:25 PM
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tank isn't overheating I have central air 24/7, tank temp ranges from 78.5 - 78.7
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Old 08-24-2017, 07:56 PM
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All other parameters are the same..?

Are u able to relocate the frags?

What led u to start dosing kalk? Was kH low?

I had some mushrooms that went from ok to all distressed and not opening. Moved them around to a lower flow area and now their fine. Guess they just didnt like it where they were anymore.
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Old 08-24-2017, 09:09 PM
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other parameters the same. the frags are on the bottom 25% of tank, lights around 8 inches off tank.

I started dosing kalk as I like how kalk is equal parts alk and cal especially in a nano tank. I used to use the BRS 1.1 / but they never stayed at 1.1, one 1.3, the other one at 1.5-1.7 which over time can throw levels out of whack.

Flow is moderate nothing crazy. I too have had mushrooms that look distressed as soon as move to low flow do much better but zoas unlike mushrooms can handle variety of flow, low flow to moderate in some cases higher.
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Old 08-24-2017, 09:19 PM
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Id cut the lights back. Go down to 60% and see if it makes a difference.
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Old 08-26-2017, 02:30 PM
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I cut the lights back as suggested from 80% to 70% @ 20K. If don't see improvement in a week will cut down another 10% to 60% @ 20K.
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Old 08-26-2017, 03:42 PM
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I'd say that's the problem.

How long is ur light schedule each day?I would do a total of 9 or 10 hours, 2.5 ramping up, 4 at the highest point and 2.5 ramping down.

Keep us posted.

Last edited by dakotakid846; 08-26-2017 at 03:45 PM..
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