I also have a (3/4 full) 5lb aluminum CO2 tank with JL regulator + solenoid + needle valve for $140 which can be used with the calcium reactor. But you needed to add a PH controller yourself to complete the setup.
Hydor powerheads K2 $20, K3 $25. Take both for $40 Pending
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75G mixed reef / 33G sump / EuroReef CS8-1 / Tunze 6206, 6055 / Eheim 1250 / AI Hydra LEDs / 2x54W T5HO / keep stocking more 
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