Provzdušňování hustě osázenného akvária. Protože názory na to, zda v akváriu se značným množstvím rostlin vzduchovat či nikoliv se velmi liší, rozhodl jsem se zařadit stránku věnovanou této problematice. Nebudu zde publikovat žádné své názory ani fyzikální poučky, pouze zveřejním části textů z knih případně z internetu. Některé odstavce budou také věnovány tématu "vyhánění CO2 z vody". Omlouvám se všem za angličtinu na svých stránkách, ale jinak to nešlo. Zatím jsem jen tak namátkou vybral tyto příklady. Pokud by jste někde narazili na další, dejte mi prosím vědět - děkuji. Ines Scheurmannová - Akvarijní rostliny strana 23: "Ať už se rozhodnete pro vnitřní nebo vnější filtr či zvolíte ten či onen filtrový substrát, není pro rostliny tak důležité. Podstatné ovšem je, aby se z vody nevyháněl CO2, který rostliny vyživuje, ještě předtím, než ho rostliny mohou využít. Nádrž, ve které mají rostliny bujně růst, potřebuje těsně doléhající kryt a voda v ní musí proudit jen slabě a bez prudkých pohybů. Do akvária nevhodné jsou všechny technické přístroje, které obohacují vodu kyslíkem nebo které vyhánějí CO2, například: - Filtr, jehož výpust vyvolává na vodní hladině silné turbulence. - Tryska jako výpust venkovního filtru, skrze kterou je voda vstřikována do nádrže. - Vzduchovací kameny, které fungují jako vzduchové zřídlo. - Závlahový filtr, protože ten vypouští filtrovanou vodu téměř bez obsahu CO2." Takashi Amano - Nature Aquarium World I strana 176: " let's look at CO2. Filters that aerate or churn up the water let CO2 escape. It is like shaking up a can of soda. All the CO2 goes hissing out into the air, and the soda is flat. Plants don't like flat soda anymore than we do. Air lift filters, pipe tube, shower, and other concentrated filters, and any filter that brings the water into direct contact with the air, causes the water to loose CO2. Water can absorb 70 times more CO2 than air can, but it also escapes much more easily. These filters are fine for aquaria that keep only fishes, but aquaria designed for plants cannot use filters that create CO2-dispersing turbulence or allow direct contact between the water and air. The filters that passes in all three areas is the one specially designed for raising aquatic plants: the self-contained power filter. But even a power filter cannot compensate for poor practices like shower-style draining that creates turbulence. The drainage tube must be located below the surface and not spray the water." Hoa G. Nguyen's low-cost/low-tech Freshwater Planted Aquarium http://www.geocities.com/Heartland/Hills/2637/ FAQ: Q: Why don't you have any airpump? A: The need for an air pump is a myth. The real function of the air bubble wands is to provide a water current on the surface of the tank. That's where oxygen enters the water, not through the bubbles (they are too small and don't last long enough). So any method of generating a surface current will do--for example, using a filter with intake and outlet at opposite ends of the tank. If you have that, you don't need an air pump, even without plants. If you have lots of vigorously growing plants, then their photosynthesis provides more than enough oxygen. When you see oxygen bubbles coming off the leaves (which I see after the lights have been on for an hour or so), then oxygen saturation has been reached in the tank water and no more oxygen can be dissolved. Thus, with a densely planted tank, you don't even need a surface current for aeration. In fact, if you inject CO2, then you do not want a surface current, which will drive off your CO2 (what you need then is a subsurface current to circulate water past the plants). My brother-in-law has a planted tank with no filter and no air pump, just static water with plants, fish and frogs in it. However, you need strong light and CO2 supplementation to have oxygen saturation in a tank. F I N S : The FishInformation Service http://www.actwin.com/fish/aquariafaq.html ``Does injecting CO2 reduce the oxygen content?'' No. The level of dissolved CO2 and oxygen are actually independent of each other; high levels of both can exist at the same time. Furthermore, if you have a set of healthy plants, they will be saturating the water with oxygen on their own. The problem is that many of the techniques used to increase oxygen content (airstones, trickle filters, keeping the water moving at the surface) also cause CO2 to diffuse out of the aquarium; i.e., if you turn off your airstone in order to keep the CO2 in, you might also reduce your oxygen content. The best solution is to keep the water moving at the surface of the tank, but inject CO2 faster than it can escape, giving you high levels of both CO2 and oxygen. AquaBotanic http://www.aquabotanic.com/DIYCO2.htm A few tips and warnings: In order to maximize the benefit of injecting CO2 it is important that you reduce any surface turbulence as this will quickly allow dissolved CO2 to escape into the air. The best ways to achieve this are to, turn of any aerators, lower any spray bars below the water line, direct the current to run around the sides of the aquarium rather than from top to bottom and/or if you have air driven under gravel filters extend the uplift tubes above the surface of the water. Optimally growing plants will produce more O2 and saturate the water with O2 better than any other method you can try.