Floating raft construction - all about rafts; horticubes block and raft hole. in backyard aquaponics we tend to grow with 1" aquaponic rafts at 8" spacing. the plants are inserted into holes cut into the styrofoam rafts. the hole spacing will vary according tweets that mention system layout #5 – raft aquaponics.. How raft aquaponics system works. in a raft system, the nutrient-rich water circulate through the long canals, usually at a depth of about 20 cm, while rafts (polystyrene or foam board) float on top. the plants are grown on the raft boards that are supported within holes by net pots..
