Yeah, I'd suggest blood meal early on then switch to bone meal when the plants are flowering. MG tomato is good as well, or if you're looking for something pretty even and low you can find Scotts 10-10-10 fertilizer at your local home depot etc. I'd go with less then recommended specially for seedlings though. All 3 listed are not water soluble, but can sprinkled on top and watered in (just as easy IMO).