Join Date: Nov 2018
Location: Oil City PA. USA
OK. I hope I can shed some light here. First being a 2.5 gallon tank I would say there is no filter, no heater. If you want to put in low light plants, Most plants need a stable temp. Between 76-80 degrees. and a PH of between 6.8 and 7.8. You can achieve this with a 2.5 gallon but it is harder to cycle and maintain the water parameters.
For plants I would suggest tropical ferns (java ferns), Anubis maybe even some low light bunch plants. These are some low light plants and easy for beginners.
I would also recommend sand as a substrate. Most plants that are well rooted like ferns would require Plant tabs in order to grow. In some cases where the plants are floating SeaChem flourish added once a month would be ideal for the plant's growth.
I will recommend a 25 watt heater for the tank, and I recommend an adjustable one. However You might find it hard to find one that fits the tank.
I would also recommend getting either a fresh water test kit, or test strips. I also recommend an ammonia alert SeaChem makes them and sold at Petco, Petsmart. Or amazon on line. The alerts are sold as a 2 pack of 1 Ammonia alert, and 1 PH alert.