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For a tank ot remain with oxygen inside there needs to be water turbulence. Will labrynth fish aerate the water themselves and not need a filter or how odes this work?

Chris

if you have only labyrith fish, than they should be fine, however a filter is always good to keep the water clean, but no it is not needed.

Labyrinth fish do not aerate the water themselves; rather, because of their labyrinth organ they are able to take oxygen from the atmosphere. However, a good filter does not only agitate water, but does it's main purpose, which is to help keep the water clean. IMO for most labyrinth fish (and indeed most fish, not just the labyrinths) a filter is necessary for good health of the fish.

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The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian.

Against some popular belief bettas can survive quite a bit of current if given time to get used to it. Mine is in a 29g with about 350gph of filtration. He had trouble at first because having been in a small container he had no idea how to actually swim aside from hovering about. He hung out on the plants for awhile but within a week he was dashing about the tank with the rest of the fish. Since the angelfish was moved he's become ruler of the tank and will chase the yoyo loaches and white cloud minnows right through the strongest areas of current if they annoy him. Mostly he's peaceful and just hangs out around the cave and front glass waiting for food.

I've also put sparkling gouramis, dwarf gouramis, paradise fish, and 3 spot gouramis in tanks with 10x turnover without issues. Ideally though you'd be better off sticking with flow around 55 times the tanks volume so 50gph filter on a 10gallon tank). It would keep the water clean and avoid dead spots while not being too much flow for any labyrinth fish. Unless your breeding labyrinth fish which requires a really still surface and low to no current your much better off with at least a small amount of filtration.