Osmocote is it safe? - Page 2 - The Planted Tank Forum
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post #16 of 39 (permalink) Old 05-06-2019, 04:18 PM
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post #17 of 39 (permalink) Old 05-07-2019, 11:38 AM Thread Starter
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Originally Posted by Phil Edwards View Post
You can also use regular Jobe's/MiracleGro fert tabs. Go for something with equal N P K like 4-4-4. Cut them into quarters and make sure to shove it down deep about 1/2" from the plant's base.

Flourish Tabs are also excellent for those plants.


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post #18 of 39 (permalink) Old 05-07-2019, 03:43 PM
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Originally Posted by Maryland Guppy View Post
Osmocote Plus has been the fertilizer of choice.
Don't remember the reason behind this though.

Plus has both micros and macros, the regular is only macros


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post #19 of 39 (permalink) Old 05-07-2019, 03:44 PM
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My concern with terrestrial fertilizers like Osmocote is the urea used. If you're going to use them, use them sparingly and push them deep into the substrate - right down to the glass bottom.

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post #20 of 39 (permalink) Old 05-07-2019, 04:49 PM
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Originally Posted by AbbeysDad View Post
My concern with terrestrial fertilizers like Osmocote is the urea used. If you're going to use them, use them sparingly and push them deep into the substrate - right down to the glass bottom.
This is good advice for any root tab. Doing so helps to encourage deep rooting and a more well-oxygenated substrate.

I've never regretted over engineering a system, but often regretted under engineering one.
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post #21 of 39 (permalink) Old 05-07-2019, 08:40 PM
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Osmocote came in two types, terrestrial and aquatic. Both came in time release pellets, and the aquatic one has extra capsules to further slow down the release. The ingredients contain ammonium nitrogen, so if the release were not time delay, it may harm fish at high dosage. The instruction recommends burying one capsule per 4 square inches, so if you have a 75gal, you need to bury something like 50 capsules, sound awfully high. I am using it for vacation plant food, and plan to place 5 in the substrate in my 75 to play safe.
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post #22 of 39 (permalink) Old 05-07-2019, 08:47 PM
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Osmocote plus has 0.52% copper. I don't recommend them if you have shrimp unless you use very sparingly.


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post #23 of 39 (permalink) Old 05-07-2019, 08:59 PM
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I think it is 0.05% copper.

https://www.ebay.com/itm/Osmocote-Plus-Root-Tabs-Aquarium-Plant-Fertilizer-Qty-20-50-100-200-300-400/281985841680?ssPageName=STRK%3AMEBIDX%3AIT&var=580 947283637&_trksid=p2057872.m2749.l2649

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post #24 of 39 (permalink) Old 05-07-2019, 09:56 PM
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I think it is 0.05% copper.

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I think it is 0.05% copper.

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Pardon me. You are correct. I lost a tank full of shrimp when the soil was disturbed so I just decided to be really careful using ferts with copper in them. I probably used more than recommended when I set up the tank. My own fault. Just putting it out there for folks that keep shrimp.

Plantex CSM-B - Copper(chelated).................................. ................ 0.1%

Thrive + liquid - Copper(Cu)..................................0.0002 %

Thrive S shrimp specific liquid - Copper (Cu) Zero

Thrive Root tabs - Copper(Cu)..................................0.0001 %

Miller's Microplex - Copper (Cu) ....................................1.5%

Osmocote plus - Copper (Cu) 0.050%

Tropica liquid ferts - couldn't find it

Seachem Flourish - Copper (Cu) 0.0001%

Aquarium Co-op Easy Green - Copper 0.00%


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post #25 of 39 (permalink) Old 05-08-2019, 07:51 AM
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Originally Posted by jeffkrol View Post
Probably one of the few that will say not to use them, or very sparingly.
In a water environment there is little stopping them from "releasing" fairly rapidly..
They make ones specifically for water environments but NOT available in the US..

bottom line is, not much different than water column dosing..
I've gone to the extreme in using osmocote and I'd generally give it a thumbsup, especially if you use it properly. Like @jeffkrol said it can release fairly rapidly into the water column if it's exposed to free water.

I once used a 1 pellet deep 26x26cm layer on the bottom of a 30x30cm tank of mine that grew a massive Cryptocoryne parva carpet. I capped the osmocote w/ about 2 inches of the black aquarium sand sold at Petco. They lasted about 2 years without having to do much additional fertilization (aside from CO2 injection). I remember having a massive algae bloom (green water) at some point during the earlier stage of the tank, which I assume is from the rapid release of nutrients. I also grew a colony of RCS in that tank that that did really well.

I have also used osmocote by filling Laguna plant spikes and inserting that into the substrate. Would really only recommend this if you can bury it deep enough (burying at an angle works decently well). I did this in my larger tanks (60gal and 75 gal) and had pretty good results.

Nowadays, I primarily use it to power grow plants that I sell on the forums. I stuff like 5 or 6 pellets into a 1.5x1.5" rockwool cube stuffed into a 1.25" net slit pot. I only recently had an algae bloom (which I'm attributing to this) because the plants in two of the pots melted and basically released all the osmocote into the water column through the channels that previously contained the plant stems.

Overall, I'd say it's a good, economical choice for substrate dosing. I wouldn't consider it a true alternative to water column dosing though, since my understanding is that some plants are preferential substrate feeders and others can benefit greatly from both substrate and water column fertilization (probably varies from species to species). I personally do both, and lean more towards substrate dosing when I'm growing crypts and erios, though I will say FME rotalas and hygros tend to do really well with both root and substrate fertilization.

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post #26 of 39 (permalink) Old 05-08-2019, 01:29 PM
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Just for reference..

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Thank you for contacting us and for the opportunity to help you with your lawn and garden endeavors.

.....unfortunately, we do not have any information on products that are sold in other countries. We also do not have information on why a product would be registered for us in some countries and not others. I do apologize for any inconvenience.

We do not recommend using Scotts Osmocate Plus in an aquarium because it is not designed for that use and the time release would be destroyed by soaking in water.

Again, thank you for taking the time to contact us and for your interest in our products. Please feel free to contact us anytime we may be of assistance.

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post #27 of 39 (permalink) Old 05-08-2019, 09:42 PM
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Interesting. The manufacturer, Scotts, does not recommend Osmocote for aquarium use. But it is marketed for aquarium use by third parties everywhere.

Seachem markets Flourish Root Tab for aquarium use. The listed ingredients suggest Calcium sulfate or chalk is the coating material, so soft water will dissolve Root Tab faster than hard water. It is the same coating material vacation fish food use.

Just wonder what coating material Osmocate employs to to delay nutrients release.
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post #28 of 39 (permalink) Old 05-08-2019, 10:37 PM
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Originally Posted by Tiger15 View Post
Interesting. The manufacturer, Scotts, does not recommend Osmocote for aquarium use. But it is marketed for aquarium use by third parties everywhere.

Seachem markets Flourish Root Tab for aquarium use. The listed ingredients suggest Calcium sulfate or chalk is the coating material, so soft water will dissolve Root Tab faster than hard water. It is the same coating material vacation fish food use.

Just wonder what coating material Osmocate employs to to delay nutrients release.
the 'balls" don't dissolve so it's more a semi-porous resin thing...


Quote:
The shells are not plastic but instead are compromised of semi permeable coating that allow moisture in and out of the prill at a controlled rate through the process of osmosis. These prills can remain for 4-6 months, and may remain even after the fertilizer is gone.


Quote:
The shell is a derivative of linseed oil and degrades biologically. One of the special qualities of Osmocote is the fact that because its nutrients are released via osmosis, it does not contribute to the eutrophication of rivers and lakes with excess nitrogen because it replaces the nutrients in the soil at the same rate that plants take nutrients up

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post #29 of 39 (permalink) Old 05-08-2019, 10:51 PM
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It didn't seem to be a problem, other than, as others have said, the balls make their way to the surface when messing around with plants. They are light enough not to be siphoned out when vacuuming, so they just sit there. I found it annoying and wouldn't use it again for that reason.

I got the gelcaps, loaded them up, and then I built an inserter using a BIC pen cap which happened to fit the gel cap in the open end. I affixed the pen cap to a stick and used another stick to push through a hole in the top of the cap. So I could load the gelcap in the end, push into the substrate, then use the stick to eject it from the pencap holder.
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post #30 of 39 (permalink) Old 05-08-2019, 11:24 PM
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Donít forget the loose beads in the substrate is what you will have after about30 min in the water when the gel cap dissolves


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My Osmocote Plus are made up of loose beads contained inside elongated gel caps. This post said that the gell cap will dissolve in 30 min.

So donít know what balls refer to that are semi permeable to slow osmotic diffusion for days. Are there different packaging for Osmocote?

I plan to use Osmocote for slow release vacation plant food. Is it appropriate?
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