For the jedi fish: fish anywhere, once you see a fish floating around and landing in a bucket, refresh the page and you should have the fish in your inventory, along with any future jedi fish you catch. If it still doesn't show them in your inventory, try again until it does. Once you reach level 5 or 6 you unlock eating fish. Eat around 30 jedi fish to unlock something. Other than that there seems to not be anything to do with them.
I figured out the algorithm for how much health black bricks have.
L is the current level.
B is the result of how much health each black brick on that level will have.
ceil rounds up a number to the next whole number.
B = L * ceil( (L+1) / 100 )
I'm not sure if that +1 is necessary. If not the equation can be shortened to:
B = L * ceil( L / 100 )
Overall, this means that when black bricks are introduced, they have double the health of normal bricks. After 200 levels, they upgrade to triple. On level 543, each black brick has 3,258 health.
I would be interested to know if I got the actual used equation right or if it's determined in a slightly different way. Hope this helps!
 "Pacifish"){kind=icon}
 "Idle Breakout"){kind=icon}
 "oO"){kind=icon}
Pretty much, yeah. It is "hp = level * ceil(level/100)".