When using holey rock, don't count on the "pound per gallon" theory. If you have enough rock to support the system and the holey rock is just for decorative purposes, I'd say leave it. Have you tested for phosphates? I've heard holey rock can leech some. The death of the tangs cannot be answered with the information provided. I'd run a full battery of tests on your water to get an idea of what the full picture looks likes nd we can go from there.
- Ben -
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