I don't know if it has anything to do with vortech's being for sale all the time or not but when I was looking into them just about every thread I looked at mentioned the great customer service that Ecotech has which worried me. I still have my koralias from 4 years ago (bought used even) and I have absolutely no idea how Hydor's customer service is because I've never had to call them. I didn't find much on how Tunze's C.S. is either because there just doesn't seem to be much that goes wrong with their products. Either way I have no dead spots in my tank that I can find and it didn't cost me a grand for 2 plastic propellers to do it.
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