yes they do well maybe some times depends what fish lombardis especialy and red forest jewls.
it means they are most likely dead or going to die
Usually at the bottom of the tank in the rocks.
That means your fish is ill
If your seahorse is lying on the bottom of the tank, it's probably dead. They normally remain upright even when asleep.
If baby guppies are lying at the bottom of the tank they are dead. They tend to stay as hidden as possible in plants as the adults will eat them.
because it cannot get out to lay them in the corner
No it can't and won't hurt anything, It will just lay on the bottom of the tank.
Until you remove it...it's most likely dead.
because the fish may be sick and does not have the sternth to swim.
The sugar would lay on the bottom of the tank so the only way to know would be to remove the tank and remove the sending unit to gain access to the inside of the tank.
Stingrays go down to the mercury bottom of the river or ocean and will lay there and die!
Siamese fighting fish lay on the bottom of the tank because they try to play dead