Viettxboii

The aim of this tank is basically low maintenance, and the specs are as follows:
Size 2.5 US gallons
Filtration - Small hob - unknown flow rate- will switch over to Elite Mini.
Lighting - Spiral 15 watt cf, at about 4.5 above the top of the tank.
Substrate(that i will be using): 0.5" layer of peat, capped with a 1" layer of fine gravel.
Plants: What i have so far: Java Moss, Hygrophila polysperma.
What i'm trying to get: Marselia spp. looking for a small species.
I need your suggestions as what to do with that "unplanned area"
Fauna: 1 male betta, 2 female guppies, planning to get lots of rcs.

Need your suggestions plantwise, and scape wise, and what i should do with the scape : D