Can tiles be placed upside down, e.g. a cloister tile?

The original DS wouldn't have any way of knowing. This only works on the 3DS, because it has an internal gyroscope. That's how it tracks motion in other games, too.

This is one of the few gag evolutions I can think of. The sprites of Malamar and Inkay appear to just be upside-down versions of each other, with the evolved...

It is molting, as it will do every couple of weeks. Make sure not to disturb or feed them when they are trying to molt.

It sounds like he has swim bladder disease or ich. If it is ich, it would be best to quarantine him, since ich is very contagious.

Most offer an easy push-to-eject function that, if pushed just right, will allow the foot to come out without breaking. Give it a little more force, and with the end...

Acetone is a possible solution, but be careful of the fumes. Also use a good scraper.