Folks, if you've recently upgraded or renewed your annual club membership but it's still not active, please reach out to the BOD or a moderator. The PayPal system has a slight bug which it doesn't allow it to activate the account on it's own.
You can, but the wire may become brittle and start cracking so I've heard. Mine is sticking out on the top but gets plenty of splash on it, so far no issues
I'm not familiar with Apex, but if it looks like a pH probe, it is NOT submersible. I have a Reefkeeper which has the option of using a similar type temperature probe....I think they call theirs an I-Probe....but instead I use a thermistor which is fully submersible and lasts forever. It looks like a wire with a little bulb type end to it....covered in plastic.