nah, high phosphates isn't deadly. Some people's phosphates are off the charts and they're still fine. A water change for peace of mind wouldn't hurt though even if it's a small one, but otherwise i wouldn't worry too much about it. just don't dose phosphates the next two times.
I assume you're talking about Flourish Phosphorus? 5ml in a 10 gallon tank is only 0.53ppm of PO4. A single full EI dose is 1.3ppm or 12.3ml. Your math is not off. Seachem is simply not very concentrated. That's one reason many people use Dry fertilizers. Not to worry.
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