Dead fry

[Dragutter]

Hi.

I've had my tank for around a year now.
Regular water changes.
Over that time I've had several batches of guppy and Molly fry born and none have survived past 2 months old.
For example the last lot born about 8 guppy fry ( who's mother died after giving birth) a couple died within the first couple of days. Yesterday one more died and then this morning got up and 3 more were dead. So I've let the remaining go to see if they would survive longer.
Any ideas what I'm doing wrong.
Any advice would be grateful.
Thanks.
It's a mix of Molly guppy platy and a couple of ghost tetra and 1 silver shark and 1 shrimp.

 

[maxwellag]

Have you tested the water? What is your tank size? What have you been feeding them? I think some will get eaten if you let them free in the tank.

 

[AngelFishGirl]

Have you tested the water? What is your tank size? What have you been feeding them? I think some will get eaten if you let them free in the tank.

^this. He asked all the questions I was gonna ask.

 

[Cactuspixie]

If the dead bodies are left in the tank it's got to be a water quality issue IMO. I presume your silver (bala) shark is still very small, but I'm surprised it isn't eating the fry.