changing KW390 AQUARIUAM TANK

Hi,

Need recommendation of a better 30L all in one tank(Filter, Light, IOS), currently I'm using KW390, it's a 3 in 1 tank (fan, Light, IOS) need to change it away.

Reason:
-over a period of time there will be water level mark which can not be wash away, suspect I need a glass tank (Main Reason)
-the Top cover can not be removed.
-The back of the IOS is fixed and I can clean it during annual cleaning.

http://www.kwzone.com/products/links...20tank%202.htm

Reason:
-over a period of time there will be water level mark which can not be wash away, suspect I need a glass tank
-The back of the IOS is fixed and I can clean it during annual cleaning.
-the Top cover can not be removed.

[burntrubber]

The water mark is mineral deposit. Even glass tanks will get it. Some people recommend scrubbing it with melamine sponge.

[profileet]

It can be easily scrap off using blade or pvc plastering flat plate