What fertilizers could be used to replace the mulm normally provided by fish? The setup I want to do will be without fish of course, and emersed with Anubias and Brazilian pennywort (and whatever other species I find). Thanks in advance.
The amount of ferts you will need will depend on how you're planning to set up the tank. How much lighting, and what type of plants you're going to grow, etc. Since fish concerns won't be an issue, you can crank up CO2 here without any worries, and just add dry ferts as you would otherwise in any other tank. In any case, start slowly to achieve better stability over time.
And for permanent emersed set-ups, you can use Ozmocote safely (since it is slow-release) or just use soil and fertilize as needed with any number of available fertilizers per label recommendations.
Ferts for fishless tank? 
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