Yes, they would do fine in a 44 hex,
A canister fitter would be fine if you keep it clean (same with any tank though).
Obstacles..... hmmmmmm.... what would you consider an obstacle? I do consider them a higher maintenance fish than the average Joe fish. Hard question to answer.
There are other fish that can be kept with them, however I keep seahorse only tanks for a few reasons. If I were to consider any fish it would have to be captive bred. My seahorses are all captive bred and are the only ones I would ever consider buying. I wouldn't want any WC cooties to get on them. There's a guide HERE that may help with selection if you choose to go that route. Just remember that every individual is different and the Tankmates Guide is meant as a guideline... not gospel.
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