Yes, it's a 24" Pacu in a 180g. It's just so big it makes the tank look small.

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How tall is the tank? I second the opinion that a tank that tall can easily not have enough light. I'd put a minimum of 100W of CFL etc over that tank.
Dont think in Watts. You need to think in PAR data. PAR designates the spectral range (wave band) of solar radiation from 400 to 700 nanameters that photosynthetic organisms are able to use in the process of Photosynthesis The one main thing plants need to live.
I love great deals on tanks..... Just picked up my 90gal along with a 75gal and a 30gal for $100. All complete with stands, working HOB's that werent junk and Quality heaters and stuff.