Question - Filter & Heater

I have a fairly destructive 4 yr old turtle (as many are lol).

We have a Fluval 306 canister filter for her tank but the output spout she keeps pulling the bottom part off it (so instead of it pushing water out the spout it then just pushes straight down). Instead of it properly circulating water it's just sitting 'flat' until we manage to fish it out of the tank & put it back on (until half a day later or so before she pulls it off again). Is there a way for us to properly affix the bottom part on that will also be safe for the turtle? Silicone maybe?

Also, she loves to attack & pull the water heater off its suction cups in the tank. Is there a way to prevent this? I've tried moving it so it's closer to the bottom and also recently moved it to stand straight in the corner but she still attacks it, tries to remove the silicone piece on the end of it, etc.

She is fed regularly and we also place sepia bone pieces in her tank for help with calcium so I don't feel it's a matter of being hungry or looking for something to grind her face on.

Any suggestions would be great :)