because the fish may be sick and does not have the sternth to swim.
That means your fish is ill
because it cannot get out to lay them in the corner
Until you remove it...it's most likely dead.
usually its cos there scared from traveling or there getting used to there new tank.
Siamese fighting fish lay on the bottom of the tank because they try to play dead
it means they are most likely dead or going to die
Usually at the bottom of the tank in the rocks.
yes they do well maybe some times depends what fish lombardis especialy and red forest jewls.
Angel fish have been known to go into a stage of shock where they lay down on the bottom of a tank and look dead. Provided the water parameters are good for Angelfish (Pterophyllum sp.), if the fish is left to its own devices it will recover and settle down. If however something is wrong with the water parameters the fish will most likely die.
Because they're tired.
If your seahorse is lying on the bottom of the tank, it's probably dead. They normally remain upright even when asleep.
Ofcourse fish do swallow rocks..they just pass straight through hem and it might make them bloated so lay off the food for a few days.