All of those products are made of ANaerobic bacteria.
These bacteria ( and enzymes) are all 'man made' for specific actions in specific environments. NOT for fish tanks!
Why would you want that in your tank or filter? ( an aerobic system)
Why would you want enzymes that break down wood and vegetable matter in your tank? ( see Mr Pleco's post above) As a result of their metabolizing anaerobic bacteria produce poisonous gas and deplete oxygen. Oxygen that your good bacteria need to function.
If you keep up with your water changes and with your filter rinsing and have a decent water flow etc then there is nothing for any Anaerobic bacteria to eat and no-where for them to thrive anyway.
Anaerobic compete with and work towards creating an environment unsuitable for the bacteria that you DO want..Nitrosonomas etc, which are all AERobic
THINK people, THINK
No-one has done proper side-by side comparisons, with test groups or anything. Any of the positive info is anecdotal and seems to be based on wishful thinking and sample studies of 1 .
ie: 'I put this in my tank and my tank seems clearer, therefore this must have done it....therefore it is good for all fish in all situations'.....correlation does NOT equal causation!
The science based hard info lets you know this crap is USELESS in a fish tank, and ESPECIALLY potentially problematic for SCALELESS fish.
The manufacturers of this stuff themselves won't tell you what exactly is in it ( what bacteria exactly etc) but somehow therefore it is safe for rays?
So, to conclude: at best these products are useless, at worst they are fatal.
If you don't keep rays, and never have, perhaps best NOT to recommend voodoo witch doctor remedies.
But hey....you get to do what you like with your own fish tanks...so carry on.......
but remember....rays are very expensive....approved aquarium bacteria are not so expensive...why be cheap ? why take such an ill-informed risk?
