dwarf seahorse

They only get to be 1 to 1 1/2 in.
They have to have special live rock and plants.
Be very careful not to get hydroids into their tanks.
They need to be fed live brine shrimp daily.
If you haven't got the Dwarf Seahorse book, go get it. It goes through everything.
In a one gallon you could get a couple of dwarf seahorses in there. Just remeber how often you will need to do water changes.
 
Water Changes more often than weekly.
No corals because you will have to use panacur on the tank to rid it of hydroids (which can sting and kill dwarf seahorses) and Panacur makes an aquarium unsafe for corals and many inverts for up to a couple of years. You will also have to be very careful about the inverts that you keep with them. Those that eat primarily algae won't survive in a panacured tank, and others could easily injure or eat your seahorses.
So, if you are ready to turn your Pico into a dedicated dwarf seahorse tank without corals or tankmates, then yes, you could put dwarves in there.
Precautions you need to take are to make sure that the intake on the filter is covered, that there isn't too strong a flow, that water temperatures are kept in the low 70's, that you are prepared to treat the tank with panacur when hydroids appear, and that you are prepared to hatch brine shrimp daily, that you keep out anything that could sting, pinch, or eat the seahorses (eliminates all swimming tankmates, crabs, hydroids, aiptasia, most shrimp, etc.)... also, think about the fact that unless you have a fish-sitter that knows how to hatch brine shrimp, you can't go on vacation.
 
I don't think so. I don't think that zoas survive panacur. Did the tanks that you saw have dwarf seahorses in them, or larger species seahorses? The requirements for dwarf seahorses are very different from other species of seahorse because they are so small and so vulnerable. Other species of seahorse won't be bothered by hydroids, but hydroids can kill dwarves, hence the need for panacur in a dwarf tank.
 
That isn't a dwarf seahorse (hippocampus zosterae), it is a Hippocampus Reidi. "Casper" is also a girl, and SHE has the potential to reach 9" long and does not belong in a 2 gallon pico. She belongs in a tank with at least 18" of water height, and at the very least 20 gallons of water, preferably more. She is also in danger of being stung by the aiptasia, which could kill her, or having her tail injured by the clam, which could also kill her. The page hasn't been updated in 2 years, I wonder what happened to her.

Edit: Here is the thread about what happened to Casper http://reefcentral.com/forums/showthread.php?s=&threadid=774220
 
I do have a couple zoas in my dwarf setup and have not obseved any problems during the last 2-3 month period that I've had them, but be careful, some zoas are very potent others not so much. Like Ann said dwarfs have very different requirements than other seahorses.
 
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