I have one of these in my 10 gallon tank and all I can say is that it works really well. This ensures a nice, even bubble wall. The suction cups stay attached to the wall (I've had issues with cheap aquarium products and suction cups in the past). I change my air manifold every 4-6 months. I first tried this one a few months ago because it's green and it suits my plants better than the previous blue diffusers I've used before. I ordered a second one today to replace my first one. There really isn't much to say. This is a diffuser. It works well. Green is good, especially for aquariums with plants. It is so easy! When I got the first one, the product literature (not sure if this qualifies as a manual) said that when the product starts to give a weaker wall with smaller bubbles, you can take a needle or button and actually poke holes in it Diffuser to make it work again (creating new airways). I've tried this with moderate success. Seems like a nice feature. However, I don't think it has extended the life of the product like I was hoping.
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