Root fert - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 12-13-2014, 07:32 PM Thread Starter
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Root fert

Can I freeze miracle grow shake n feed Into ice cubes and put under my substrate? It says 1 tablespoon per square foot. Sound right?
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post #2 of 4 (permalink) Old 12-13-2014, 09:50 PM
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Looks like it is a slow release fertilizer, perhaps similar to Osmocote. I think I would try half or 1/4 as much, those instructions are for land plants.

On land the water is intermittent, so the fertilizer is releases slowly, when you water the plants.
In the aquarium there is always water, so the ingredients are always leaking out of the pellets. It can get to be too much fertilizer, especially if you have a more open sort of substrate like sand or gravel.

Test a bit, maybe put a dozen or so granules under the substrate and test the NO3 after a few days. Use the ice cube method or just poke them in deep by hand.
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post #3 of 4 (permalink) Old 12-14-2014, 12:41 AM Thread Starter
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Thanks.
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post #4 of 4 (permalink) Old 12-14-2014, 02:08 AM
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Osmocote and Dynamite Select have proven safe for aquariums.
I bought empty gel capsules size 0, filled them with the fert and just stuff them under the substrate about every 4 inches.

Last edited by Sammie1; 12-14-2014 at 02:09 AM. Reason: better wording
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