And there are shorter versions on magnetic mounts, that cost more, and economy versions on suction cup, taking too much space, even id part with impeller is small enough. The come in flow rates, starting with 256 gph or 1000 lph, way too much for smaller tanks.For FW planted tank depends on species, probably 4-6x. This is more for reef tanks with their high flow, to to 50x tank volume per hour. It is possible to position few of them to create certain flow pattern, leaving to dead spots and bringing dirty water to the filter intake. They are an additional to the filter source of flow. If you do large water changes you can just oxygenate that water by ignoring it for a day, churning the hell out of it, or just running one of your airstones in it for a while before adding it to the tank. This is typically ignorable in smaller routine water changes, the aeration in your tank should fix it quick enough. Some water supplies, including well water, are deoxygenated right out of the tap. In tanks with both fish and plants you need to balance aeration for the needs of both. "Emergent" plants that grow underwater and breach the waterline will be fine and don't care about how much you aerate the water, since they breathe from the air. It removes CO2 from the water that they need, and floating plants strongly prefer calm water, though if you can make an undisturbed area for them in the tank they can't escape from using baffles or something that works just fine. Keep in mind that while aeration is good for fish, most plants hate it. The simplest reliable way to get some aeration from a filter with no chance of it going wrong is just to have the outflow above the water line so the water falls back in from a small height, if you don't mind the noise. You can get quite a bit of aeration by positioning your filter outflow in a way that causes it to reliably disturb the surface, though remember to consider how a drop in water level from evaporation might effect that getting max aeration from a filter outflow is unstable enough to the point I'm quite uncomfortable relying on it. The speed of the waterflow has a small but mostly ignorable impact on the aeration provided. There are no gradients between these states, the given water surface is either one or the other. It aerates water about 14 times better than no water movement at all does. "Turbulent" flow aerates water about 3.5-4 times more than "Laminar" flow does. They have a stronger effect when positioned to disturb the water as much as possible versus nestled in a corner. The purpose of your sponge filter is also to do this, it doesn't actually aerate the water through the bubbles, the bubbles just disturb the surface a lot. Trickle filters aerate the water quite a bit because of this. This includes "Surfaces" inside things like filters where the water is churned up to hell or falling through the air. The only factor in aeration is how disturbed the surface is, in a specific way. Airstones don't really break easily, they're just stones, but their pump can. One of the reasons people use powerheads/wavemakers is it's usually cheap to deploy them in pairs so if one fails everything keeps living until you notice the problem. Two airstones is almost certainly plenty of aeration for that. Your stocking isn't that much so you likely don't need that much aeration. You don't "Need" them though it really depends on what you're doing.
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