Moisture Control - Too Wet
If red wigglers to bloat and turn white or leave your compost bin altogether, your compost is too wet. You don't need to cover your compost bin, but you should occasionally add dry material such as peat moss or newspaper. Shred or tear up the newspaper first or it won't break down at the same rate as your other refuse. Add a few more holes to your bin and turn your compost to circulate the air and dry out your bin a bit.
Moisture Control - Too Dry
A compost bin that is too dry runs the risk of dehydrating the worms. The bin also needs moisture to aid in the decomposition process. During dry spells, add more wet items to your compost like food scraps and spray the bin lightly with water. When adding water, don't drench the bin. A light misting until the material in the bin is dampened will suffice.
A Healthy Red Wiggler Diet
Red wigglers will chomp their way through a good portion of the food scraps you give them. In addition to most fruit and vegetable scraps, they will enjoy used coffee grounds and tea bags, crushed egg shells and grass clippings. However, do not give your red wigglers animal products, fats or candy. Avoid adding too many acidic foods like lemons. Also avoid bread products, as these tend to attract rodents and raccoons.
Location
Your red wigglers will thrive almost anywhere you put your compost bin. But avoid placing the bin in any areas of your yard where the direct sun hits for more than a few hours during the summer. The heat is too much for the worms and also dries the bin out. Your red wigglers prefer a shady spot where their home won't get too hot and is protected from heavy rainfall by the overhead branches.