I decided to turn my 90 gallon salt into fresh. I previously ran a 75 gallon fresh and loved it. Last time around i used organic fertilizer, clay and capped it with eco complete. Ideally i would use eco again but am not patience and want to get started. I prefer not to pay $24 a bag and don't want to for petco to go on sale. do you have any alternative and or mix substrate suggestions.
nutrients (not inert)
a bit of density (i.e. eco vs some of the clays)
Dark color (ideally black)