How to de-rim a glass tank? (eta: LOL broke off a chunk of glass) - The Planted Tank Forum
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post #1 of 16 (permalink) Old 09-07-2012, 03:25 AM Thread Starter
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How to de-rim a glass tank? (eta: LOL broke off a chunk of glass)

Wondering what the steps are to de-rimming one of those glass tanks from Petco? I haven't gotten a new one yet (with the sale going and all), but everyone loves the clean, rimless look. You know..

You can't simply peel off the black plastic, since it's necessary to safely hold the tank together. Or is it?

Last edited by caykuu; 09-08-2012 at 07:25 AM. Reason: eta
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post #2 of 16 (permalink) Old 09-07-2012, 03:32 AM
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I've derimmed a Fluval Edge 6 gallon tank by taking the glass top off it, I'm also in the process in de-rimming my 29 gallon long tank. I've seen people derim tanks up to 90 gallons, and have no problems with the tanks, but I personally wouldn't derim anything above 40 gallons.

As for "peeling" back the plastic, most tanks have the trim held on with silicone, so it's a bit of a project in getting the trim off, but nothing a few straight edge razor blades can't take care of.

And the trim isn't necessary on most tanks, the trim is mainly used by the manufacturers in order to hold the glass steady so it can be sealed along the edges..... If you looks at ADA tanks, they have no trim on any of them......

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post #3 of 16 (permalink) Old 09-07-2012, 03:48 AM
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get a heat gun/blow dryer then heat up the top plastic rim. use a utility knife and break off the plastic. then get a metal scraper and apply moderate pressure while scraping. just to be safe, i would not de-rim the bottom half of a tank that is more than 10 gallons. good luck
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post #4 of 16 (permalink) Old 09-07-2012, 03:59 AM Thread Starter
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I'm probably going to be de-rimming a 5.5 gallon. Or maybe even just 2 gallons.
What's the risk of leaking for de-rimming both top and bottom for those sizes? xD
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post #5 of 16 (permalink) Old 09-07-2012, 04:38 AM
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Quote:
Originally Posted by caykuu View Post
I'm probably going to be de-rimming a 5.5 gallon. Or maybe even just 2 gallons.
What's the risk of leaking for de-rimming both top and bottom for those sizes? xD
No real risk of leaking, but tank will still have horrible silicone job. Why not just pick up a Mr. Aqua from MarineDepot if you're in socal?
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post #6 of 16 (permalink) Old 09-07-2012, 04:44 AM
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I have a 75 gallon that has the bottom part derimmed, and I have had 0 problems in the several months it's been set up. 5 gallons won't be an issue leakwise, but it will be hard to get all of the silicone off.

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post #7 of 16 (permalink) Old 09-07-2012, 04:51 AM
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5 gallon is really easy to crack the glass when you remove the trim, because the glass is so thin. Some people even cracked the 10 gallons because its so thin.
I derimmed a 75 gallon tank, its up and running without braces for more than a year now. I kind of regret derimming it, the silicone job is just so ugly.


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post #8 of 16 (permalink) Old 09-07-2012, 04:52 AM Thread Starter
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I just don't have that kind of money to spare, at the moment. :s I've spent too much on other things over the summer. Mainly thinking about taking advantage of Petco's $1 per gallon sale, and thinking about making it a prettier tank than with that fat, black border.

I'll attempt de-rimming just the top then

ETA Nalu: Dang.. If the silicone is really so hard to get off, I may not.. Have you tried sandpaper? (or was that a noob suggestion LOL)

Thanks for the replies, guys!
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post #9 of 16 (permalink) Old 09-07-2012, 05:24 AM
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A razor blade will take care of any excess silicone.

Sandpaper will scratch the glass or acrylic.
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post #10 of 16 (permalink) Old 09-07-2012, 05:54 AM
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Quote:
Originally Posted by caykuu View Post
I just don't have that kind of money to spare, at the moment. :s I've spent too much on other things over the summer. Mainly thinking about taking advantage of Petco's $1 per gallon sale, and thinking about making it a prettier tank than with that fat, black border.

I'll attempt de-rimming just the top then

ETA Nalu: Dang.. If the silicone is really so hard to get off, I may not.. Have you tried sandpaper? (or was that a noob suggestion LOL)

Thanks for the replies, guys!
What I ment was, the silicone on the bottom is really ugly and even sometimes one corner glass is higher than the other.

Single side razors do the job really well to take of the silicone, just use a lot of them. And be careful, when you do it, its really easy to cut yourself on the razor or the sharp edges of the glass.

Sandpaper will scratch, but I used a dremel with the sandpaper roll to make the edges less sharp.


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post #11 of 16 (permalink) Old 09-08-2012, 07:22 AM Thread Starter
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Tried to de-rim my 10gal with my bare hands and a mini saw..
Successfully went around 2 corners... then the third plastic corner came off, and a huge chunk of the freaking glass went with it.

Whatever brand this is does their silicone job really well. :\ Man.

Yep, now I have a broken tank. LOL. It was old anyway.

ETA: I just noticed that I cracked the surface of three of my nails. Maybe bare hands wasn't a great idea for me... xD haha
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post #12 of 16 (permalink) Old 09-08-2012, 07:51 AM
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Sorry if it's too late. I use braided fishing line to cut through the silicone (mono is too weak, but the braid stuff is super strong).

Good Luck the next time around.


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post #13 of 16 (permalink) Old 09-08-2012, 08:52 AM
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I use a kitchen knife (maybe the dull ones) and heat the knife with fire on top of my stove. Wait till the knife turned red as it heats and cut the plastic rim that way. Repeat heating the knife when it's hard to cut the plastic rim.

To clean the silicone I use multipurpose razor from 89 cent store (not 99 cent but 89). Just scrape it along the glass. Don't worry it won't scratch it.


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post #14 of 16 (permalink) Old 09-08-2012, 10:10 PM
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I just saw and rip ... Saw and rip ...
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post #15 of 16 (permalink) Old 09-08-2012, 10:17 PM
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I derimmed a 10g and I used a longer utility blade, wedged it between the rim and the glass, and cut away. Worked OK but I got a bit too rough with lifting off the last corner and pulled a chunk of glass off like you Still used the tank anyway and it started leaking from the bottom about 6 months later. Never derimming a tank again!
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