Hi Yvonne, as advised by Anyfoot , i have used rectangular tray as hingeback loves to stay in water a lot.I would use a plant saucer sunk down into the substrate instead of that plastic rectangular container.
I use a plant saucer and a cat litter tray, what I should have said before was I have flat rocks in the cat litter tray so it's not too deep, the rocks also give grip. Saucer for just drinking and litter tray acts as a bath, they love soaking .Hi Yvonne, as advised by Anyfoot , i have used rectangular tray as hingeback loves to stay in water a lot.
She asked me go for cat litter but it was very deep so instead used this tray. appreciate your advise!