Oh.. One other thing I should mention about H. comes - *theoretically* they're more reef safe than other species, except for H. barbouri. All non-dwarf seahorses should be okay with most SPS and softies, most seahorses are not okay with most LPS. It is possible, but I'm afraid to test this in practice, that H. comes are okay with a wider range of LPS.
However, seahorses should never be kept with anemones, clams or aggressive fish (such as tangs or any clownfish other than true/false percs). I do have some 'horses with a Kole Tang and they've been working out well, but Kole Tangs are extremely shy.. And the one we have is probably shy for a Kole Tang...
Pete Giwojna has an excellent list of seahorse compatible corals here:
Seahorse Compatibility
(Taken from "A Seahorse Reef, Part 1: Reef Compatibility of Hippocampus spp." by Pete Giwojna, originally published in Tropical Fish Magazine.
In theory, H. comes may be compatible with table 2 corals, but NOT table 3.
From the second part of the article, here's a list of seahorse compatible fish:
Anthias (assorted Mirolabrichthys, Pseudanthias, and Anthias sp.)
Firefish Goby (Nemateleotris magnifica)
Purple Firefish Goby (Nemateleotris decora)
Gobies (assorted small species)
Neon Goby (Gobiosoma oceanops)
Assessors (Assessor spp.)
Midas Blenny (Ecsenius midas)
High Hats (Equetus acuminatus)
Marine Betta (Calloplesiops altivelis)
Banggai or Banner cardinals (Pterapogon kauderni)
Flame cardinals (Apogon pseudomaculatus)
Pajama cardinals (Apogon nematoptera)
Pipefishes (assorted small species)
Percula clownfish (Amphiprion percula)
False percula clownfish (Amphiprion ocellaris)
Royal Grammas (Gramma loreto)
Blackcap Basslets (Gramma melacara)
Green Chromis (Chromis viridis)
Longnose Hawkfish (Oxycirrhites typus)
Six Line Wrasse (Psuedocheilinus hexataenia)
Flasher Wrasse (Paracheilinus spp.)
Fairy Wrasse (Cirrhilabrus spp.)
Scooter Blennies (Synchiropus spp.)
Green Mandarin Goby or Dragonet (Pterosynchiropus splendidus)
Psychedelic Mandarin Goby or Dragonet (Pterosynchiropus picturatus)
Orchid Dottyback (Pseudochromis fridmani) – avoid other Pseudochromis
species!
Good inverts for seahorses include decorative cleaner shrimp like those
listed below:
Peppermint Shrimp (Lysmata wurdemanni)
Scarlet Cleaner Shrimp or Skunk Cleaner Shrimp (Lysmata amboinensis)
Fire Shrimp (Lysmata debelius)
and/or
large ornamental snails (living sea shells) such as the following:
Tiger Cowry (Cypraea tigris)
Deer Cowry (Cypraea cervus)
and/or
Assorted Feather Dusters (Sabellastatre magnifica, Sabella sp.) whose
colorful crowns resemble gaily-colored parasols.