One of the goldfish in my pond is constantly trying to swim around with its head above the water and never seems to stop. All of the other goldfish in the pond aren’t doing it and all seem to be acting normally.
The pond has a pump, fountain and a filter and the sponges are regularly cleaned when the get to dirty.
Whats wrong with my fish?

i am making a blood fountain for Halloween and i really need a water pump (it needs to be cheap) the water pump will pump the water into a skull i have all the things except a water pump! i really need a cheap water pump and the only ones i can find are like 60 bucks! can someone tell me were i can get a water pump really cheap, like around 20 dollars or under, or tell me how to make one?

A fountain designed to stray a column of water 7 m into the air has a 2 cm diameter nozzle at ground level. The water pump is 2.6 m below the ground. The pipe to the nozzle has a diameter of 4 cm. Find the necessary pump pressure.