j4d

i am wanting to set my tank up with a few more fish at the moment i have 3 black widow tetras, approx 5 guppies.. a couple of suker fish and an orange and black tetra... i had alot more guppies and neon tetras but they all died... i have spent a fortune n fish but i keep losing them... this tank has been stable for a month now... i have a good filter system, have the light going all the time and a bubble curtain... i love the black widow tetras as they follow everything.. my guppies get pregnant but we have had no fry... help please and recommendations on what to add to my tank