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Pentair is the gold standard but not sure what’s their smallest model. Can also look into Aqua UV. Fitting any in the back chamber will likely be a challenge. I’d avoid Coralife, jbj and other cheap stuff.
I've got a similar question. Did you find one that will work with the IM 30L?
I'd recommend a debary unit. I use these on my bigger tank. They are absolutely quality, however I have a small nano in which I used a cheaper uv in an aio. It's not pretty but this is how it sits
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What you wanna be looking for is UV-C, and a reasonably wattage. Keeping the flow dialed in to the specific requirements. Most uv's will say 90% effective at this flow for example. I can say the cheaper uv has done a reasonable job, but you can tell the difference in quality over my debary units
is that an australian company? I dont see any in the north american retailers...
http://www.debary.de/hp/index.php/en/welcome
This is the debary website but I think you may need to find a stockist in America. Unless they will do from the eu. Mind you these are the absolute top of the range imo and their prices show that. Like I said I went a cheaper one for my little nano and I have had good results. Realistically Uv-c and a the right flow and should do a reasonable job
But I have and will use the debary on bigger systems because I think it's quality is worth it. When a bigger system has a bigger $$ value of inhabitants

