Thanks for the compliments . First of all, this community has been great, and I've learned a lot from threads here and from friends I've been able to make "in real life." I am also nowhere near an expert, and I'm making changes probably because my tank is not where I want it to be.Hey Gabe, I just read through your build thread. Congrats on such a fantastic tank! And I'm impressed how quickly you have seemed to master complex issues that take most people years. That's a lot of reading!
I wanted to find out what made you want to add T5s to your AP700s. I'm planning an upgrade to the Red Sea Reefer 750 which is a little larger than your tank but I was only planning on 2 AP700s like you had, based on manufacturer info. If you felt it wasn't putting out enough light or not good enough light, I'd be interested to learn more about your experience. I've been using Kessils since their first light and I'm pretty much mentally committed to the sleek LED fixtures (not combos) but would be open to a different type or more of them if needed.
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Two AP700 is more than enough light for a 6 ft tank (like the 750xxl). For my 5 footer I wasn't even up to 40% intensity (though I was increasing it). I did par measurements in another thread and the AP700s had lots of light to spare. I bet most people can't run these lights at 100% because they're so powerful.
Lighting is a personal preference. I don't think it's debatable anymore that LED fixtures can grow SPS. I've noticed many sps tanks that I admire have t5 or led/t5 hybrid. I really like the shimmer of led, and I think a hybrid t5/led fixture is the best of both worlds. I also like to build/tinker/learn, so this was a chance for me to do that. Maybe next year I'll be using metal halide!
But rest assured, two AP700s has plenty of light and I'm really happy with them. Btw, I now have some extra mounts if you're open to getting them used. A surprisingly pricey item.
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