If you want to breed them, it is better for a bare tank to facilitate maintenance.
However fast growing and hardy plants that can thrive in non-acidic conditions such as hydrophila, vals and water sprite (Ceratopteris thalictroides) are suitable plants. I find java moss will do too. But the use of gravel might cause 'rotting' disease- fin-rot, body-rot... if it is not properly maintained.
Try to keep the pH between 6.5 to 7.5... Below 6.5, the occurrence of tail-burn is quite high.
What kind of guppies do you plan to breed?
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