Freshwater cliff modular version

The basic size is 50x55 (w x h), the thickness is ca 2 cm only!!! The weight is neglectable. The size of the backgrounds are fit to a 50, 100, 150, 200, 250, etc size aquariums. It is very easy to trim to the requested size in case of any other sizes they are lower than 60cm with a sharp knife or saw. On the bottom it should be concerned to leave out 5 cm that is usually covered by sand, or grind. Common silicon used for aquariums is proposed to fix the backgrounds to the glass. It is floating if it is not fixed to the glass. The panels are made of polyurethane, including the paint and thanks for our technology, it resists almost all type of the L-catfishes!!! We are not able to prove this is true for all type of catfishes, but in the last 2 years we do not have any complaint from the shops that the customers had problem with it!!! Thanks for the pattern of the elements the panels can placed in many order. For example:
2 panels: AB, BC, CD, DA, DC, BA,
3 panels: ABC, BCD, CDA, DAB, ABA, BAB, CDC,DCD,
4 panels: ABCD, BCDA, CDAB, DABC, ABAB, BABA, DABA, BABC,CDCD, DCDC, DCDA etc
5 panels: ABCDA, BCDAB.etc..