I have had two toadys for about 2 years. About two months ago they both at the same time quit extending, with absolutely no changes made by me. About 3 weeks ago i bought a new one (all opened up and pretty) and put it in my tank and it closed and has stayed closed. Im perplexed as well. Last week I started adding Iodine(very very cautiously) and the new one and one of the elders starting to just barely extend ( just breaking the surface about a 16th of an inch). From all the information Ive gathered thru this experiment(reef keeping) everything/everybody indicates iodine can be very lethal to the whole system, so before I continue with iodine I first must get a test kit, which Im planning on doing over this weekend. I will post any results and will keep looking for any of your inputs.