Frogspawn are like torch coral. My torch, which underwent massive growth, was placed at mid-level to the side of a 250w MH
in light-moderate flow. The torch didn't like its arms being blasted around by the current, but a very gentle swaying action. I'd assume somewhat similar conditions for a frogspawn.
125 gallon saltwater: 55gal sump, 4 Blue-Green Chromis, Purple Tang, True Perc, Firefish, Royal Gramma, 5 Ricordea, Bubble Coral, 15 Pulsing Xenia, Green Star Polyps, Deresa clam, Green-Tip Torch Coral (about 11 "heads"!), Orange Montipora Cap, Purple M. Digitata, Green Slimer Acro. Yongei, 3 Orange M. Digitata, Pink&Green Acro. Millepora