Cannot get my chaeto to grow for the life of me!

[DKoKoMan]

Currently tested yesterday at:

• Salinity - 1.026
• NO3 - 10 ppm
• PO4 - 0.06 ppm
• ALK - 8.9 dKH
• CAL - 450 ppm
• MAG - 1350 ppm

Currently using a clamp style lamp directly above the water with a CFL 100w spiral bulb. I added a maxi jet 400 in the chaeto section to provide more flow then the baffles alone from the overflow to the return. I thought maybe flow was lacking.