If your tank holds less than 10 gallons, look elsewhere. This one is large, which explains the complaints of the bladder not coming out. The bladder stone is larger and more air pump power is required to release the bladder. But I love it, it's like a mini dance floor in my aquarium. LEDs are more scattered and therefore bubbles. But best of all, a great bang for your buck. The other $10 options are a tiny 4 LED bubble jewel that looks pathetic compared to this one.
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