RO/Di resin = PO4?

Randy Holmes-Farley · Mar 4, 2016

Cory said:
Interesting. So over feeding means something new here. Basically food doesnt have to be broken down by bacteria once it passes through the fishes digestive system to release po4 into the tank water. Correct?

The old 1 inch of fish per gallon rule, or whatever it was, isnt only for ammonia then but po4 too.

Correct.

There are bacteria in the GI tracts of fish and people, and some of those will likely digest certain organic phosphates that people (and possibly fish) cannot. Things like phytate.

Talk about a lot of phosphate in one organic molecule!!!

This is phytate:

http://www.nourishingdays.com/2010/09/what-is-phytic-acid/

But in terms of aquarium husbandry, that is all "fish" metabolism, even if some is bacterial inside the fish.

Cory · Mar 4, 2016

Randy Holmes-Farley said:
Correct.

There are bacteria in the GI tracts of fish and people, and some of those will likely digest certain organic phosphates that people (and possibly fish) cannot. Things like phytate.

Talk about a lot of phosphate in one organic molecule!!!

This is phytate:

http://www.nourishingdays.com/2010/09/what-is-phytic-acid/

But in terms of aquarium husbandry, that is all "fish" metabolism, even if some is bacterial inside the fish.

Wow thats a lot of po4!! 6 atoms of po4 for 1 phytate molecule! That must raise po4 quite a bit.

You said "In a human, most of the phosphate consumed comes out in the urine and a smaller amount in the feces. Notsure on a fish how exactly the phosphate is primarily excreted, but balance studies (in vs out) show it does come out. Even in growing juvenile fish, most of it is excreted."

Does this help?

http://www.sciencedirect.com/science/article/pii/S004484869900157X

Its believed to be in the urine, no?