Algamic is the shit. I never, ever grow without it. You want deep green leathery looking leafs, all healthy, algamic is your friend.
Your doseage sounds very weak though. It's only an additive, and doesn't raise the EC hardly at all. Maybe 0.1 per 1ml a litre. I use it every watering aftere the first 3 weeks, at any rate from 2-5ml per litre. You can't burn your plants using algamic, trust me. It's great for Mg and Ca, so you need to add a fair bit to keep the plants happy, especially if you get a Mg or Ca def.
It also have amino acids, vegetable extracks, trace elements and god knows what else. It works amazingly as a foilier spray too, aswell as in the feed water.
I never looked back once i bought it the first time and have never grown without it since. It's much better than your average seaweed extrract. And only ÂŁ10 a litre, doesn't seem expensive to me.
I'd stick with it if i were you, it's one of the only two things i will never grow without again, the other being mollasses.