Manuals and product brochures are supposed to guide you on how to use the product properly, advise of any compatibility issues, etc.
One should not need to google if a Vectra is compatible with Apex, because if it is not, that should be mentioned in the product online literature, packaging, manual, etc.
The fact none of the above mention the compatibility issue, makes me think this is done intentionally by ETM in order not to lose sales opportunities, should it be known their pump is not compatible with the number 1 Aquarium Controller in the world !!
This is cheating ! They would rather make you purchase the pump, knowing that it will fail when used with Apex, and instead of them taking ownership and providing replacement parts, or repairs., they blame the customer for using the product as per their own manual !
This is very shady !