Structured backgrounds

If it's one that looks like a rocky wall, I think they look most effective if you let algae build up, occasionally rubbing with a kitchen scrubber if it gets too much. :)
 
those last year when i went to japan i got some....and imo it's the same if u put it inside..or outside...i have it on my 55 gallon tank and you dont even notice it!...well it's just on the right side..it is also common in hong kong :)
 
i got a foam background today with build in filter....what kind of glue could i use to attach it to the back or hold it down....
 

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