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Unread 09/22/2017, 08:18 AM   #1
BigT75
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Magnets

Hey guys I am getting more n more into buying frags who isn’t lol anyways I want a frag rack gonna make one from a egg crate and want it attached to the side glass with magnets can I use any magnets from say lowes or Home Depot ??


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Unread 09/22/2017, 11:02 AM   #2
ssky
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I seen people use magfloats to hold the egg crates


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Unread 09/22/2017, 11:15 AM   #3
jcgso
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Not for inside the tank. Has to be coated/waterproof. You can find them on Amazon.


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Unread 09/22/2017, 12:16 PM   #4
mcgyvr
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Most Ceramic/Ferrite magnets can be used in water without issue without any coating applied to them..

The same cannot be said for rare earth/neodymium magnets..

Ferrite/ceramic based magnets are typically black in color without any plating,etc.. neodymium magnets are usually nickel plated (shiny chrome type look) or similar.


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Unread 09/22/2017, 12:21 PM   #5
billdogg
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I get mine from www.kjmagnetics.com They have them in a multitude of sizes and strengths, both bare metal and plastic coated. I got the plastic coated ones and they work like a charm.

hth


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Unread 09/22/2017, 01:43 PM   #6
ca1ore
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+1 for KJ


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Got back into the hobby ..... planned to keep it simple ..... yeah, right ..... clearly I need a new plan! Pet peeve: anemones host clowns; clowns do not host anemones!

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Unread 10/01/2017, 08:06 AM   #7
Thomas Ng617
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I just made a frag rack out of a couple magnets that I picked up from the local hardware store and used a acrylic piece that was part of a little shelf thing


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Unread 10/01/2017, 08:08 AM   #8
Thomas Ng617
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Quote:
Originally Posted by Thomas Ng617 View Post
I just made a frag rack out of a couple magnets that I picked up from the local hardware store and used a acrylic piece that was part of a little shelf thing



And oh by the way the magnets I bought were plastic coated except for one side which I used the silicone to cover and stick to the acrylic sheet that I have


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Unread 10/05/2017, 11:15 AM   #9
Zephrant
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Might be able to coat them in 5 minute epoxy too. I'm thinking that a little epoxy in a slightly oversized hole, then cover the magnet too. Black epoxy might look cool.

Looks like Plastidip may be aquarium safe too, anyone tried it? I ask because I have a stack of neodymium right here that would be convenient to use.


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Unread 10/05/2017, 11:25 AM   #10
Zephrant
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144 ceramic magnets, about 9 cents each: https://www.amazon.com/Nesha-Ceramic.../dp/B01CPMY89E

vs. 10 plastic magnets at $1.65 each: http://www.kjmagnetics.com/products.asp?cat=164

I'll try the epoxy first, then the ceramic ones at that price.

I see notes in the reviews that the ceramic ones are not very strong, might be an issue for a frag rack.


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Unread 10/05/2017, 06:14 PM   #11
ca1ore
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3-4 lb. of pull is unlikely to be sufficient.


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Simon

Got back into the hobby ..... planned to keep it simple ..... yeah, right ..... clearly I need a new plan! Pet peeve: anemones host clowns; clowns do not host anemones!

Current Tank Info: 450 Reef; 120 refugium; 60 Frag Tank, 30 Introduction tank; multiple QTs
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Unread 10/06/2017, 02:02 PM   #12
Webmanny
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Agree with the post above. I have done exactly what you are trying to do with great success. However, I used N52 20mm magnets, which have a pull of 19 pounds each. I just got some epoxy and coated them. No issues in several years that I had that rack.

This is a photo of the rack or a portion of it.


I even did some individual ones that I wanted to have the flexibility to move up or down to adjust for the light need.



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Unread 10/06/2017, 02:03 PM   #13
Webmanny
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Another view of the rack:



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Unread 10/06/2017, 07:46 PM   #14
jamie1981
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Quote:
Originally Posted by Zephrant View Post
144 ceramic magnets, about 9 cents each: https://www.amazon.com/Nesha-Ceramic.../dp/B01CPMY89E

vs. 10 plastic magnets at $1.65 each: http://www.kjmagnetics.com/products.asp?cat=164

I'll try the epoxy first, then the ceramic ones at that price.

I see notes in the reviews that the ceramic ones are not very strong, might be an issue for a frag rack.
Those ceramic ones won't hold anything nor do they even need to be coated with anything. That is the same type of raw magnet that pump impellers are made of. They do not rust or corrode. Not in the same class as neodymium magnets which are super strong and will rust or corrode when not coated with something.


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Unread 10/06/2017, 08:22 PM   #15
Zephrant
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Good info, thanks- Looks like the neodymium ones, coated somehow are the best plan.


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