Putting Osmocote+ in Substrate (BDBS) - The Planted Tank Forum
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post #1 of 6 (permalink) Old 07-27-2016, 12:09 PM Thread Starter
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Putting Osmocote+ in Substrate (BDBS)

So I'm running black diamond blasting media for my substrate, and I'm intending to go to a dutch aquascape. Will the osmocote+ be harmful to my fish if I put it in the substrate too long before I plant? What kind of timeline should I aim for if so?


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post #2 of 6 (permalink) Old 07-27-2016, 12:35 PM
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I would use the stuff sparingly and sprinkle a small amount per volume of water on glass before capping with dirt/sand or whatever.
Or place small capsules if it is in capsule form, one each near root feeder or group of root feeder's/stem plant's.
The stuff is slow release ,and may take a week or more for protective resin or whatever to begin allowing the fert to dissolve more readily in water.
Stuff is said to feed terrestial plant's for up to six month's but Maybe four month's in my experience submerged in water.
I sprinkled maybe a measured cup full on bottom glass of my 80 gal (four foot long ,21 inches wide) before covering with dirt,peat,catlitter mix ,and Black diamond as a cap.
I think too much can cause issues and maybe even harm root's of delicate plant's but have no proof other than observation's when I used much more.
Hope this helps.
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post #3 of 6 (permalink) Old 07-27-2016, 12:38 PM Thread Starter
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So then ideally I need to completely evacuate the aquarium before putting this stuff down.


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post #4 of 6 (permalink) Old 07-27-2016, 12:43 PM
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Originally Posted by APynckel View Post
So then ideally I need to completely evacuate the aquarium before putting this stuff down.
No, you do not need to remove the substrate to put this in. I would wait until you actually plant the tank to install it. I recommend the capsule kind - you can buy gelcaps online if you have already bought the bag of Osmocote+.

Shove a capsule under the plant when you plant it and you should be fine You don't need to overdo it.
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post #5 of 6 (permalink) Old 07-27-2016, 12:46 PM Thread Starter
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Originally Posted by Niyona View Post
No, you do not need to remove the substrate to put this in. I would wait until you actually plant the tank to install it. I recommend the capsule kind - you can buy gelcaps online if you have already bought the bag of Osmocote+.

Shove a capsule under the plant when you plant it and you should be fine You don't need to overdo it.
I already have a loose canister of the stuff. I could go buy some gelcaps to do root tabs, but I'd rather do a "general area" sprinkling than a high dose under a plant. I'm going to have LOTS of plants, so I don't know if root tabs will work as ideally as it being spread out under the entire substrate.

Bump: Threads I've found state 5 grams per square foot of substrate. I've got an ~18" cube, so 11.25 grams is what I calculate.

Unfortunately, this means I need to completely drain the tank and siphon off my substrate. Well that's going to be fun.


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post #6 of 6 (permalink) Old 07-27-2016, 01:41 PM
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If your sprinkling it, then you want the stuff deep in my view lest the tiny prill's work their way to the surface.
They will also work their way up if you uproot or move plant's about very often.
Is why I sprinkled mine on bottom glass before covering it.
In 18 inch cube,I might use a couple tablespoon's.
But that's just me.
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