Question about planted aquarium and fishless cycling

Rookie mistake I guess. Maybe, an excuse to get a second tank ?. Aqadvisor warned against other fish fin nipping guppies but not the Danios. Yes they went in the tank together last night. So far no nipping. I did notice the Danios getting to the food first. That lead me to put food in on each ends of the aquarium. Noticed the Danios getting to the food on top and the guppies get the food as it starts to sink.
Water peramitors were good this morning, l will check daily as recommend.