Do I need a mat under my second hand tank? New to hobby. - The Planted Tank Forum
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post #1 of 7 (permalink) Old 04-16-2020, 06:17 PM Thread Starter
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Question Do I need a mat under my second hand tank? New to hobby.

This is my aquarium. It's 122cm (4 foot) external width. ~200L




This is the stand I've built.




Will I need a mat or styrofoam or something underneath the aquarium glass? Or will it be fine on the plywood?

The bottom glass is level with the sides at the corners but seems to be bowing out in the middle.





Thank you for your help.
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post #2 of 7 (permalink) Old 04-16-2020, 08:18 PM
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A rimless tank always needs a mat.
Without the plastic rim the glass can move. Causing a leak. The mat keeps the tank level.
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post #3 of 7 (permalink) Old 04-16-2020, 08:19 PM
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Hello and welcome!

Long and short is that yes, you will need a yoga mat or Styrofoam under any tank that doesn't have a rim, yours included.


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post #4 of 7 (permalink) Old 04-16-2020, 08:43 PM Thread Starter
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Ok thanks. I wasn't exactly sure if it was rimless or not because it has the glass around the top where the glass lid sits and I didn't know if that counted
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post #5 of 7 (permalink) Old 04-17-2020, 02:21 PM
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A rim would be the big plastic pieces at the top. The extra glass you are referring to is a eurobrace. The plastic rims serve the same purpose on the top, but it is the bottom that is in question here.

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post #6 of 7 (permalink) Old 04-17-2020, 08:41 PM
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Definitely need a mat for a rimless tank.

Rethink your stand. The corners and edges of the tank base need to be supported to the floor. With 5-20 gallons you can get away with it but you've got a lovely large tank. Tank, mat, wood all need to be matching size then the legs directly under the corners and a frame under the wood connecting to the legs. Google DIY stands Template Reef Central for way too much wordage on the subject.

Go ahead and use the cinder blocks as legs but add a frame of 2x4" lumber to the tank footprint sized wood. 2x4" is strong enough used on end for the span and you won't lose your space for equipment underneath.

Since the glass is bowing out a little you might want to google how much deflection is normal and fine. Since this is a used tank examine the silicone between the glass looking for bubbles. Bubbles can mean the silicone is starting to fail and it could be a good idea to take the tank apart and redo the seams. I built a 9 gallon tank with glass thick enough for a 75 gallon tank. There are bubbles and even algae growing in the space between glass in one spot but no deflection and tank didn't fail. I hope it's fine, I cleaned silicone off 12-14" former seams and it was a horrible job.


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post #7 of 7 (permalink) Old 04-20-2020, 05:18 PM Thread Starter
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Quote:
Originally Posted by Kathyy View Post

Rethink your stand... Google DIY stands Template Reef Central...
That is a great resource, certainly information overload haha.

The besser blocks are 10mm wider than the tank so should fully sit under the corners if I move them a bit wider.

Thanks
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