i kinda do a mix, i give 1/2/3/4 rats to 10g when they drop litters ( just depends whats available or full ) I'm also runnin 5 or so in 20s and 7 in a 30. another also just gave birth in the rack, but i don't really have anywhere to put her so shes staying in the rack slot dedicated to preggos. the other 4 racks have a male and ~10 females ( depending how many are in mom tanks ). I'm getting an average of ~75 or so babies a week i think. haven't really had too much issue with them eating them. and i tend to mess with em quite a bit. iv also seen the dad rats help out on occasion, before i switched to the system i use now
perhaps your rats aren't as used to humans? just a thought based on my observations of my rats
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