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Just as I said, it's impossible to know the sales numbers or the percentage of breakages. There are 800,000 salt water aquarists in the US - and 2 million world-wide. RedSea acknowledged that a couple of their larger tanks had an issue - and they provided a brace. Other than those types of tanks - I'm not aware that other tanks don't have more or less problems. Most people with no problems don't post 'Today my tank is doing great'. That said - of course I have deep sympathy for anyone thats had a huge mess/lost coral/fish/etc. There is another thread out there with a list of people who had significant problems with another brand of tank. when I buy a tank - I assume - that some day - it may very well leak. I've had one experience with this - with another manufacturer. when a fish knocked a piece of rock and it made a small crack/leak in the bottom glass - of course this rapidly became a big mess.
I think you are somewhat missing my point.
Napkin math....
2 Million demographic.
Let's say 20% of those are "large" tanks in the 125 - 175 gallon range.
=400,000 thousand aquariums.
The vast majority of "larger" glass tanks sold over the last 3 decades were All-Glass, Ocean or Marineland and the vast majority of those being the standard 125 gallon plastic trim tank. So let's say that of the 400,000 10% of those are sold in the last 5 years. so 40,000 aquariums.
Now consider that for the past 10 or more years the trend for 125+ gallon aquariums as predominately acrylic. Let's guess 60/40 (more like 80/20... but we will be kind) So that 40,000 glass aquariums becomes 24,000 GLASS aquariums.
Now let's assume 20 glass aquarium vendors but Red Sea is large, so let's give them 15% market share. That is 3,600 aquariums in the size range we are talking about.
If you can find 50 reports of failures on the internet there are likely 150 failures real world (reported or not), and almost ALL OF THEM are the same basic failure.... That is approaching a theoretical 5% (1 in 20) failure rate.
Are my numbers accurate? Maybe and maybe not even close. But the point I am making is that the number of systems sold is small so ANY reports, let alone a rash of them following a patterns is significant.