I don't think there will be any problem using polyethylene tank and black colour as long as they are clean from any chemical residue. Black colour is actually preferable for lesser chance of algae growth.

http://www.projectfeed1010.com/blog/2014/07/15/aquaponics-components/

Thanks for your answer, It is ok to use polyethylene tanks black color.

Many experiments of fish have been done using black polythene tank.

Dear Dr.Rakesh, thanks for your answer. The experiment will be done in tropical weather(Malaysia) and no effect on tilapia fish due the experiment in non controal Condition just under plastic shelter.

Yes

Yes you can

It wont be a big problem. But you have to consider about the durability of the material. And also the spines of Tilapia fish, may cause to damage the polythene very easily. It is better to use double layered hard polythene material for your aquaponic system.

Yes, it will be fine, it keeps away the sunlight from penetrating from the sides, thus preventing growth of algae/moss.

I wold recommend to pay attention to biotic film developing on the internal surface of the tank which is scraped by fish feeding

Of course, you can.

Estimado Abdelrazzaq .

Si puedes usarlos, actualmente estoy desarrollando unos prototipos con acuaponía en Colombia y hasta el momento funciona bien! Saludo.

yes you can but not for long period

Por que razón?

Dear Abdelrazzaq,

You can easily use polythene but try to use double layer or thick layered polyethylene to avoid damage due to the tilapia spine scratch. Optimum feeding will save you from biotic film formation. Black colour will save from algae growing in the system. Is it a recirculatory system?

Black color will retard algal growth

double layer or thick polythene will work, however you need a strong frame to support. the black colour will retard algal growth.