The bin is 96 quarts or in gallons I believe its 24 gallons. If I had to guess I would say there is maybe 3-5 thousand in the above bin. All different sizes.
I think the 14 gallon for 28 orange heads is fine
They dont breed as fast as lobsters so it will take them a little longer to outgrow that bin. Lobsters reproduce very quickly so it isnt possible to put small numbers in the bins without using hundreds of bins!
For heat right now I just have them on top of my reptile cages (the homemade wooden ones that allow for things to be placed on top). When the reptile lights are off I have a space heater in the room that I use to keep the room at 80 degrees.
I dont have orange heads yet but I believe that they do require slightly more heat then lobsters to have good reproduction outcome. You could put a thermometer in the bin and see what temp it is getting in their. It should be around 90 degrees. If it isnt getting warm enough maybe try some sort of heat pad underneath?
Hope I helped! Lindsay 