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You click the darker water underneath the statue of Poseidon on the seahorse.
if you mean in mythology island, you dont play a tune for the hydra thats only for the dog you have to jump on their heads if you need help just go to youtube and type in poptropica cheats mythology island
Its in the clam in the water maze near the hydra's cave.
you have to go to that water place with bird thing and snatch the pomogranate out of the tree
swim to the top
you need to get the water on going down starting from the top of the mountain to the bottom ,and then the phoenix gives you the flower
ZClimb up the aqueducts and hit all the switches and tip over all the bridges
Defeat the hydra who is found in a cave in the bottom left of poseidon's water maze.
On the island Old Poptropica on the water tower.
You just have to jump on the Sphinx back and allow the water to flow. It's not a riddle she just wants you to water the rose and in exchange she will let you keep it.
U have to find where its flowing from and just pull the lever then find the next then the next until the water is flowing on the Monster Thingy
Fix the aqueducts.