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Orchard hay can be used in as a substrate, but what is suggested is a mixture of 50% clean topsoil and 50% COARSE -playsand. The Fish tank should be replaced with a tortoise table. The Tank is not an adequate home for tortoises. It stressed them as well as a big cause of respiratory issues. This is a Tortoise Table and how to construct it : http://www.tortoisetrust.org/articles/Tortoisetable.htm
You also need to lights A UVB which I suggest a Reptisun 10.0 linear tube and a Basking light. They should have a calcium supplement to work with the UVB light as well as have a high fiber diet of grasses and hays to mimic their natural diet.
I hope this information is helpful and it addresses your concerns.