I run 2 skimmers, but had problems initially.
As others stated, one skimmer can affect the other. In my case I was using a EuroReef RS180, then added a Tunze 9010. Problem was that the Tunze needed much calmer conditions than the ER. So the Tunze never worked. I got rid of that and matched things up better and added a Hydor 1000. Both have been running flawlessly for awhile now with no issues.
I personally tend to try and run the Hydor a little wetter and the ER dryer, the combination is very effective.
So besides redundancy, it does a great job cleaning, but be aware... Probably the best would be adding 2 of the same, if not, using 2 that are compatible.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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