[header] How to help guppy fry grow [title] Create a stress-free atmosphere. [step] This is very important because stress causes death in mature fish, not to mention small fry. You can help by introducing a few artificial plants or live plants for your fry tank. 
Having pebbles for fry to hide is a good idea as well. [substeps] Your fry should be separated from other fish or mature guppies.