I don't think the UG hurt her. She could've gotten spooked and hit her head. There are a lot of drawbacks to UG, but I've used them for years with my Mbuna. I don't use them with plants, the roots get tangled up in them. Just because there is a technology that some like better doesn't make the old tech into a killer. UGFs have been used successfully for decades. I do think they make a lot of work, but my personal opinion is that as long as I'm wasting space in my tank for a gravel layer, I might as well get some filtration benefit from it. I'm really sorry about your fish, but please don't blame yourself. This kind of thing has happened to all of us and you may never know exactly what went wrong.
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