Never used sea blast, but Flora Nova Bloom is a good choice for an easy, problem free grow. Lucas formula is 8 ml per gallon for that I think, I used it many years ago and then switched to Maxibloom, which is essentially the same nutes, just dry. Use less while your plants are young and see how they do, increase up to the 8 ml per gallon as they get bigger and can take more nutes. Good luck!