you should consider soilmaster select... cheap and better CEC than sand. onyx is not even dark gray... it's a lightish blue/gray in my experience ( i have a 55 almost full of it mixed with 3m colorquartz). It's good stuff, just not black. shipping is the biggest issue with buying a substrate you can't find locally. if you're paying out the ears for shipping, go ahead and buy the one you want the most. Eco complete is a fantastic all around substrate, a little pricey, but not horribly so... onyx is the perfect size and weight, and has a great CEC and some calcium that leeches slowly to keep gH and kH stable, soilmaster is cheap, has a high CEC, and comes in a true "black" color like tahitian moon sand or eco, tahitian moon sand is fine (too much so if you ask me), heavy (can cause compaction issues), and has virtually no CEC, and is not cory or loach friendly. shop around and do some searches here before you make your final choice.
Eheim Pimp #171
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; Eheim 2217, TurboTwist UVS, Seachem Onyx / Black T-grade ColorQuartz, 2x55w AHS CF, BeverageFactory.com CO2 Regulator with Clippard accessories
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