I would put the filtration in place as soon as possible. The tank needs to "cycle" that is get a working population of bacteria. This take time. An old way is to put fishfood in there, as if you were feeding fish. The food degrades and puts the bacteria to work, which start to multiply.
Start with small amounts but feed daily. Degraded food will also produce NO3 wich is plantfood.
Ed
Start with small amounts but feed daily. Degraded food will also produce NO3 wich is plantfood.
Ed