Who Gives A Fish Forums

Aqueon Pro is solid, you're good to go. Just make sure the thermostat isn't buried in substrate or pressed against the glass, like fruitblast said. Heat distribution gets wonky if it's not free-floating.

Depends on the brand and model, mate. Most modern heaters are designed to be fully submersible, but some older or cheaper ones might not handle it well. What's the make and model? Also, check if it's got a waterline mark—some have a max submersion line.

I recently picked up a pair of LED fixtures that I'm really happy with - they've got 10000k white and actinic blue, and the colours they bring out are superb. I found them on Ebay under the brand Beamswork, and for the price, I think they're a great value compared to some of the other options out ...