returning fishkeeper after 2y

Hi everyone just returned to fishkeeping after about 15 yrs ish, got 64l 2ft external, stock at the moment 2 appistogramma  nijensi? 3 ottos, 3 Cory Julii, 5 black phantom tetra,2 flame plates and 2 guppies (oh the shame). I also support a guy with autism and we are starting a 180l malawi tank...