Does UV sterilizer kill Pods?

Pete_the_Puma

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Hi fellow reefers,


Long story short I have a 140 Gal RedSea peninsula 650 tank. It's been up for 2 years now. The first 20 months were HELL mostly due to a long battle with Dinoflagellates from having undetectable nutrients in the setting of barebottom AND refugium with a large kessil grow lamp growing massive cheato. The war was finally won after plumbing of a large UV sterilizer and taking the macroalgea out of the refugium, which remains a safe place for pods with tons of rock, rubble and some detritus (pod food).

The fish and coral are doing well, and I have TONS of tiny bristle worms. Nutrients are detectable at 0.05ppm Phos and 0.5-1.0 ppm nitrate. There are small tufts of hair algea here and there (a welcome sight after dinos!). I do have a six line wrasse and some cardinal fish but had never had those completely eradicate a population of pods.

The issue is there is not a SINGLE pod to be seen anywhere despite regular seeding with "5280 Pods" from Algeabarn (every 8 weeks).

Now I understand the dinos are toxic to pods, but the dinos are now long gone and I do have GAC running 24/7 to remove any possible "toxins" left over from the dinos. The last seeding with pods was about 4 weeks ago and I still cannot see a single pod anywhere (Have had Reef tanks since 2005, I know where to find those guys!).


I posted in the AB forum and some people commented the UV might be killing the pods, which seems plausible but once they are in the rocks don't they usually stay there rather than going around from tank to sump and back? (UV is plumbed into the return line from sump to tank). I cant believe all the people running UV sterilizers (probably 10-20% of reefers would be my guesstimate) all have ZERO pods in their tanks? Is that possible?


Anyone have any insight let me know!



Pete
 
Yes. A lot depends on the flow rate. Higher flow rates will not kill larger pods. It will still kill pod fry and smaller pods.
 
Depends on the kind of pods. Never bought pods because I generally think its a waste of $$, but if the pods are free swimming/water column pods (i think tisbe are such) then, yes, the UV will take them out. If the pods live on/in the rock and substrates then the UV will impact them minimally.
 

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