I had 7 of them over the years for about 10 year's total for the usage of each.
I've never seen any difference and tried in vain to show any difference in growth or any other potentially measureable parameter in an aquarium.
I think I covered the bases, repeated a number of test of their marketing depts potential benefits that was claimed, never found anything significant, even the most staunch advocates admitted the same when questioned about it.
Tropica also will tell you that the optimal flow rates for plant roots is much lower, about the rate of no cables, for aquatic plant roots.
There is not scientific support that I have ever been able to find on the topic.
2. Practical "does it work"
4. Lack of any research based support
I see no support, no reason, and that is a waste of $.
If anyone can show otherwise, I'd be happy to see their test and research.
Just a simple test, simple methods etc, it need not be complex.
Many have turned their cables off during the summer and never seen a difference, later, they toss them out entirely and still never saw a difference in the winter either. It's a heater, that's about it. Does not hurt, but sure does not do what the marketing depts claim...........
Say..........how would you like to buy some Hydrilla pills that provide concentrated DNA and increase vigor and stamina? :tongue: