One thing to consider with RO/DI process, is that it removes everything the good and the bad, leaving the water almost equialent to a liquid vacuum, not great for human drinking, or many fish.
Think about vacuums, anthropamorically speaking, the want stuff because they have nothing, just like cold sucks in hot.
In your body, the RO/DI water wants stuff(osmotically) just as it does in a fishes body.
There are few fish that live in, or come from that kind of element free water(even discus need some trace elements to stay healthy).
If you raise those kind of soft water, low element, osmotic water fish your may get away with small mineral additions.
But if you want and hard water type like Central Americans, or rift lake Africans, you prep withRO/DI may be harder and as expensive as the salt water hobby trying to keep tanks stable. And RO/DI systems produce lots of waste, getting out a little water.than reprodu
Think about vacuums, anthropamorically speaking, the want stuff because they have nothing, just like cold sucks in hot.
In your body, the RO/DI water wants stuff(osmotically) just as it does in a fishes body.
There are few fish that live in, or come from that kind of element free water(even discus need some trace elements to stay healthy).
If you raise those kind of soft water, low element, osmotic water fish your may get away with small mineral additions.
But if you want and hard water type like Central Americans, or rift lake Africans, you prep withRO/DI may be harder and as expensive as the salt water hobby trying to keep tanks stable. And RO/DI systems produce lots of waste, getting out a little water.than reprodu