looks like they are a brackish fish and like water below 72 degrees 
heres another link for more info about them: Batrachomoeus trispinosus "Freshwater Lionfish" | Brackish | Freshwater Fish | Aquarium Livestock - ThatPetPlace.com
looks like i wont be getting one
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55 Gallon
1 Bala Shark (Balantiocheilus melanopterus) 9-10"
1 Albino Rainbow Shark (Epalzeorhynchos frenatus) 6"
1 Cuvier Bichir (Polypterus senegalus) 5"
1 Clown pleco (P. maccus) 3"
3 Yoyo loaches (Botia Almorhae) 2"
Moss, 6 Java ferns, and a Amazon Sword
2 Aqua-Tech power filters 30-60g 330gph
Whisper 30-60 air pump
Marineland stealth 200 heater (rated at 55g)
48" 6500k spectrum plant bulb |