08-27-2007, 01:42 PM
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1) Wrt to the O2/CO2 issue I can only "say how I handle it".
My tank has 4 jets which are submerged.
Due to the rate of the return pump and the size of the orifice of the jets the velocity of the water emanating from these jets is significant.
Three of the jets I have oriented such that the energy is dissipated via the walls and sides of the tank but such that the remaining energy causes flow across some, if not most, of the bottom of the tank.
The fourth jet I have directed toward the surface but "against a side wall".
The flow from this fourth jet creates a minor turbulence on the water's surface (my definition of which is undulations and not waves).
I also have two air bars and one air disk which Chris put in the aquarium for aesthetics and which can generate what I term moderately violent turbulence of the water's surface (my definition of which is waves but no splashing water).
With the nozzle and/or with the addition of the air induced turbulence I have had no problems growing "easy to grow plants".
(I will generate a thread in "Articles" because the additional oxygenation due to the the release of air by air diffusers has had benefits which are not reported in the literature.)
2) Excel will not replace CO2.
What Excel will do is provide, what I term, nutrients to your plants as well as what is termed "trace minerals" in the literature and which I term as catalytic elements.
3) From my experience in domestic waste water treatment and "dealing with water stagnation (and hence fish kills)" the concept of the water "being in the air in dispersed form" before entering the receptacle is very, very good. The only reason for not implementing the preceding is "your fishies not being able to deal with it" or Jk not being able to "deal with the noise".