So next week I'll be receiving an order of plants for my 275 litre tank I've read a few times that people recommend using fertiliser, and my question is...what's the best (and not overly expensive) fertiliser you'd recommend? I want one that WON'T kill snails, as I'm planning to get some nerites this weekend in an attempt to combat my algae issues. I also have some Malaysian trumpet snails, so it's vital that it doesn't kill snails!