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I have the 24'' T-5 Aquactinics for my 20g, and my crocea is about 9'' from the top. Had it for 3 months, and I can easily see shell growth. I'd say a good inch for the top of the shell. It looks perfectly healthy. But no matter what, water quality is as important as your lighting. From what I've heard, individual reflectors are very important with t-5 lighting. This is why I chose this fixture.
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