i have 4 cory cats in a 20 gallon with a betta and 2 ghost shrimp and a cardinal tera(i know they do better in schools im getting more). what should i feed the cory cats temporarily till i can get more food and also for the tetra hes never at the top of the tank more bottom and lower middle. what can i tempararily feed him. im so sorry i do do my research i just completily forgot to get food we were in a huge rush. am i a bad fish owner for this, first time?