I would imagine its a matter of personal taste. As both can work.

I do not like plastic troughs because of several reasons, one is they taper and lose volume. This occurs in the area of the substrate, which is where I want the most volume. They also are soft and do not hold heavy substrates well. Ever try pushing or moving a plastic trough full of dirt? They are also harder to dig up eggs in. But again, thats my own personal opinions, based on what I do.

As far as rust, I have many steel tanks that have been in continious use since 1991 and have not had a problem yet. In fact, they are most likely good for at least that long in the future. As in, I have not had to make a single repair in all that time.

My bet is, you will not keeping monitors for that long, so rust is not a problem. Cheers

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