What all do I need to buy? My plants are growing very nicely but it's getting expensive to replace seachem bottles every so often. I currently use Tetra Flora Pride, Flourish Comp, Excel, and root tabs/osmocote.

Plants are cabomba, swords, Java fern, water wisteria, and water sprite.

Also do I need to buy anything for measuring or can I guesstimate with home teaspoons? I'm lost!