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Fertilizers in canister filters

Is there any point to putting fertilizer tablets (I'm thinking
specifically of Duplarit K) in one of the media chambers of a
canister filter for it to dissolve slowly?  I do have some in the
substrate near the roots of the plants (but I came upon this too
late to put Duplarit G in initially).

Any other types of fertilizers that would lend themselves to this

Julie A. Craves
Rouge River Bird Observatory
jcraves at umd_umich.edu