I don't have any Cardinals yet, but I hope to some day. I'd really love the Harlequins if I'm ever able to find some.
My pH is around 7.6, and I agree with you, after further research, this tank probably will not fit a Sulawesi shrimp species. I've heard Malawi are pretty adaptable, though.
I do have a small 25 watt heater that I bought for this tank, fully adjustable as well. It's a Hydor that I purchased from Kensfish.com.
I've decided not to use Sulawesi. I didn't know Blue Bees were that small. That's a turnoff, actually. Is there any other Cardinia species that would go well with Orange/Yellow Neos? I'm looking for contrast...