Hello to all
Is anyone using titan vecton 850 uv or have used it and any pros and cons? Will it work for reefer 250 with a separate 5 gallon refugium? Why I’m trying to use UV is to somewhat control the Ich population
As long as they rate it for parasite control for your size of tank – check with them before buying if you aren't sure. A specific flow rate should be called for, and parasites will be at the lowest-flow end of any suggested range they give you. Only algae and bacteria would be significantly effected at the higher end of the range.
Let me ask what ELSE are you doing about your situation?
Assuming it's ich (really Cryptocaryon) then UV may not make the most sense as Crypto is one of the more UV-resistant pests due to its (relatively) large size. Micron filtration would be a a better option – but it's worth saying that UV+micron covers a wide range of pests and micron is much cheaper to run than UV, so why not both?
Ruby Reef makes an effective set of in-tank treatments that ALSO work well, at least with micron filtration. (They tell you when UV should be shut off.)
Other measures would mostly relate to feeding and de-stressing the fish so their immunity can be recovered. Reduce overcrowding. Eliminate aggression. Provide the fish with more swim-throughs and hiding spots. Feed frozen or even live food as much as you can. Etc.