A mixed diet will always be best . Once you've moved to pinkies and fish (say 1 pinky and 2-3 pinky sized pieces of Salmon/Trout) feed every four days. Have a browse on my website (link in sig) you'll find I've rambled on quite a bit about feeding and other things in the husbandry section and my blogs
Forgot to say - 30C should be the the temperature on the substrate at the hotspot. Adjust with a thermometer and your thermostat until the right temp is reached.
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