Aerating Green Water Options

[smgutie]

since we are talking about balance, night aeration will also probably introduce O2 back into green water since O2 wil be depleted by both fishes and algae. conversely day aeration will thus also introduce CO2 back into the green water since CO2 is depleted by algae.

and bringing this logic further on, day aeration will probably improve photosynthesis of algae (up to the limit of available food source) since it introduce essential CO2. maybe can experiment to see whether green water will turn green faster with or without day aeration.

I thought you can't get CO2 back into the water unless you

1. dissolve pure CO2 into the water by pumping it in water
2. have Dissolved Organic Componds (DOCs) evolve into CO2 (cant remember by what process, sorry)

water turbulance defeates the purpose of CO2 in the water because i heard it only releases it.

I may be wrong, this is just what I learned from readings on growing water plants. Please correct me if I am wrong.

[square_guy]

I thought you can't get CO2 back into the water unless you

1. dissolve pure CO2 into the water by pumping it in water
2. have Dissolved Organic Componds (DOCs) evolve into CO2 (cant remember by what process, sorry)

water turbulance defeates the purpose of CO2 in the water because i heard it only releases it.

some link which states aeration works both way for O2 and CO2. atmospheric equilibrium is the key.

http://www.thekrib.com/Plants/CO2/airstone.html

and from Hobbit in AF

HI square_guy,

As I've mentioned, dissolved O2 concentration and CO2 concentration is independent of each other.

What you should take into consideration is that there's always an equilibrium betw, atmospheric O2 and dissolved O2.

Theoretically, this can happen in the following situation:

1. if the atmospheric O2 drops, O2 will then come from the water to replace it. Or that

2. if O2 in the water is saturated, it'll dissipate into the air.

For the first instance, it'll never happened in real situation. It is only hypothetical.

For the second instance, it almost never occur in a bare tank situation, as aeration deployed by us will seldom saturate the water with O2.

However, in a planted tank that is actively photosynthesising, the water is saturated with O2 eventually, as )2 is a by pdt of phtotosynthesis. Thus, you can see oxygen bubbles rising to the surface, in a well planted aquaria.

Then again, saturation point of O2 is also dependent on the water temp. At 15 degrees celcius, the saturated concentration would be about 11.3ppm, and at 25 degrees celcius, it is around 8.1 ppm.

Hope to have cleared your doubts.

Cheers,

Kenny

see bold. 2 points to note
a) aeration drives off saturated O2 in water.
b) at higher temp, O2 saturation concentration is lower.

i think this supports my earlier post that aeration and higher temp will reduce risk of O2 burn, since at lower temp the water can hold less O2 and O2 will also hit saturation point faster. upon saturation O2 will be driven out by aeration.

[Seacucumber]

yikes!
this topic is getting too cheem for a simple minded person like me....

[LASERGUY]

some link which states aeration works both way for O2 and CO2. atmospheric equilibrium is the key.

http://www.thekrib.com/Plants/CO2/airstone.html

and from Hobbit in AF



see bold. 2 points to note
a) aeration drives off saturated O2 in water.
b) at higher temp, O2 saturation concentration is lower.

i think this supports my earlier post that aeration and higher temp will reduce risk of O2 burn, since at lower temp the water can hold less O2 and O2 will also hit saturation point faster. upon saturation O2 will be driven out by aeration.

Eh.... don't know there is Lord of the Ring character in AF leh.....

[mountain]

AF also have a bugger who can shoot arrow chun chun like an elf .. think his name is Aero-King

[CyberET]

As you know I rely on artificial lighting to control the "sunlight". Event then, sometimes the green gets very intense on the 5th day yet I only change water on the 7th day no matter what. That's silly, especially if I were to KIV another day which is when disaster usually strikes. 

From now onwards... I'll change water on the 7th day or whenever the green is too intense.

theres a difference between's andy's and your artifical lighting.. sunlight is way stronger in light penetration compared to PL lighting.. so i don't think you would experience O2 burn easily.. however when your green is too intense.. i believe there issn't sufficient light penetration, and the algae may start to collaspe.. my opinion..

[CyberET]

i did posted sometime ago in AF with respect to this particular statement. i don't agree with you, but unfortunately i also dun have anytime concrete to back up my beliefs. here goes...

aeration is to restore balance of gas dissolved in water. eg at night, aeration will expel excess CO2 in green water. so going along this line of reasoning, during day aeration will expel excess O2. since we are talking about balance, night aeration will also probably introduce O2 back into green water since O2 wil be depleted by both fishes and algae. conversely day aeration will thus also introduce CO2 back into the green water since CO2 is depleted by algae.

and bringing this logic further on, day aeration will probably improve photosynthesis of algae (up to the limit of available food source) since it introduce essential CO2. maybe can experiment to see whether green water will turn green faster with or without day aeration.

do i make sense? u guys can bomb me now 

other than too much O2 in intense green, the intensity could cause algae to start dying as light can penetrate as well.

imho.. day aeration also expel excess O2 & CO2 as well
lesser aeration during the day seems to turn my water intense green water

[CyberET]

err.. i think u mis-interpreted the paragraph..
let me try .. i think wat it means is about the efficiency about gill functions..
if u dump a heater in.. the gill will need to work harder to get the same amount of oxygen into the blood stream. tats why in hospital tank where there is always a heater + salt .. and finally  should be "Highly Aerated" as recommended by all the medication instructions..the highly aerated condition is to compensate the ratio . ..
then for green water, bro HB fish is really struggling for oxygen liao, there is prob not much dissolved oxygen left due to the mass of algea... same for introducing medication into clear water rite? the medication will dissolved with water reducing the "space" for oxygen .. so .. critical mass compete against a couple of duds.. think tats why his duds lost..
alamak..w t fish i mumbling abt.. it still doesn't answer oxygen burn vs optimum oxygen level

highly aerated normally means the medication uses O2..
HB fish struggling for oxygen at night most prob due to suffocation as stocking level is too dense.. more organism per litre competing for oxygen.. either increase aeration during night or reduce stocking density

[square_guy]

lesser aeration during the day seems to turn my water intense green water

u mean earlier or later ??

[square_guy]

Eh.... don't know there is Lord of the Ring character in AF leh..... 

there are many hobbits in AF. in fact he is hobbit number 6003

[CyberET]

u mean earlier or later ??

earlier

[GA Secretary]

1 Member sent his/her complement!

stanhong23