I'm beating a dead horse, but in case any new reefers see this:
There are no official statistics on tank failure rates by manufacturers. Anecdotally, however, I'd say that at least 9 of every 10 tank failure posts I see on social media are from Red Sea. It's prevalent enough that I'm actually more surprised when it's *not* a Red Sea tank.
Red Sea's customer service is also atrocious. When my Red Sea Reefer 250 tank seam suddenly delaminated (didn't fail, thankfully, but only a matter of time until it did), Red Sea's response was paraphrased, "Damn, that sucks." Their suggestion was to sell me another Reefer 250 at a discount; which, when combined with the shipping and tax, was roughly the price of retail. When I asked about a discount on a Reefer 250 Gen 2 (because they had updates targeted towards this issue), they refused and basically said, "Take it or leave it."
I am one voice. Take everything, everyone says with a grain of salt (myself included). But I strongly advocate staying away from Red Sea.