Hi Giniah! Seahorses wrap their tails around sticks because they are relatively weak swimmers; they only have 1 fin, after all. Wrapping their tails around sticks- or hitching, as we call it- lets them rest when they are tired of swimming around. "Sea sticks" can be anything a seahorse could wrap their tail around. Gorgonian corals are a popular choice, as well as macro algae. If you don't want gorgonians or macro algae, you can also use fake corals. For more information on basic seahorse care, and a list of "sea sticks" that are safe for seahorses (some corals will sting seahorses that hitch on them, which can be fatal), check out seahorse.org or fusedjaw.com. Both of those websites have lots of good information and advice.