Why do seahorses go up and down?

Can adding too much or adding too fast make the diatomaceous earth return to bottom of the pool? What most directly and able salmon to swim a? Where does fish keep there money? What is the optimal pH for hydroponics? Are basking sharks extinct? Will tetra eat baby molly's? Breeding net says to remove female after she drops eggs but male needs to fertilize them still so I am confused how the net works.? What is the average size of a baby Greenland shark? How big is a 100 gallon fish tank? What do fish eat on the tundra? How does the shape of the perch help it swim? What commonly found larger tropical fish can you put in the same tank as guppies? What noise does a bull shark make? Is fish unicelluar? Do guppies carry their babies in their mouth? Do sharks eat zombies? Why does a water fountain appear to pulse? How can you fix the problem of dead grass over your septic tanks? How is the operculum of a bony fish more efficient than the gill slits of a cartilaginous fish? What do eels look like?