Hmmm... my guess it is what is attached to the biocube. Let's dream...

29 gallon Tank $290.00
Stand $130.00
Halide $250.00
670.00

Stealth Heater $ 20.00
Saphire Skimmer $170.00
Prime 1/15 Chiller $300.00
CPR Refugium w/ light $200.00
Tunze Nano Stream $120.00
$810.00

Argonite Sand $20.00
Live Rock $5/lb $150.00
$170.00

Fish $50.00
Corals $250.00
$350.00

I could easily spend $2,000 before adding an R/O unit