InTank is required for your Biocube. My biggest complaints are the cost (but it's hobby related) and I wish it could fit a little tighter in the second chamber. I have an older Oceanic Biocube so it may not fit perfectly. My other dissatisfaction can be isolated from my use. I wish the middle chamber was bigger. I run Chaeto as a mini retreat and it's filling up that space fast. I don't need as much room for a piece of filter thread in the top compartment, and my chemistry doesn't fill the bottom compartment. In general I highly recommend it.
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