No worries, I didn't know crap about additive's and such, but have leared a lot quickly.
Well it all depends on what your tank levels are, if they are low you should add with top ups for sure. But if they are ok then you should not have to add with every top up. I check my parameters weekly and adjust if need be.
For test kits I use API for everything except Mg I use Elos.
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