Totally agree with the chems.
For food, I recommend you start growing and (heavy) dosing phytoplankton. The DT bottles I would buy started getting expensive so I started growing my own and dosing 2xday, 1- 1/2 cups per dose. My frogspawns, hammer and filter feeders exploded in growth after this (I don't have a torch-yet).
And I mean exploded. My 5 pieces grew from 2 heads each to 5-7 heads each, and big. It is awesome. This growth didn't happen until I started dosing the fresh/live phytoplankton daily.
I grow 2 - 2 liter bottles while I keep 2 in the fridge for feeding, and go through them in about 1 week - 10 days.
That's what I recommend for growth.
Oh, and this is controversial, but I also got rid of my skimmer and put in an algae turf scrubber, so that the phyto didn't just get skimmed out right away but existed in the tank. Many would argue with this choice, but I didn't see major growth in the Frogspawns and hammers until I made these changes.
Good luck!