Hi, I live in the caribbean, on a penthouse apartment and here is my Aquaponic NFT System.

- 30 gal pond
- one 4 in diameter pvc tube, 20 feet long - top
- one 6 in diameter pvc tube, 20 feet long - bottom
- Started the system in January 2010
- Plants in the system: 16 lettuce, 13 tomatos, 3 garlic, and 3 chives

Latest test to the pond:
PH: 7.5
NH3: 0.1
NO2: 0.0
NO3: 13
Temp: ºF 87

So far everything is running smooth. Plants are growing very nice. Fish are very happy.
Goldfish and Koi's is what I have in the pond.

My goal is to go bigger so y can grow tilapia in the pond.

What is a good size pond to grow tilapia?

I was planning to go for a 125gal pond. Is this big enough to grow some tilapia? How many of them?

Thanks.