I am still fairly new, only 2.5 years with darts, but I'll tell you how I have such a great supply of isopods! I only bought them once, when I was starting, over 2 years ago. I bought 1 culture of them with a mail order of supplies. I have seeded all my vivs. I have 2 small grow out tanks (12x12x18), and about 3 or 4 months ago I emptied them of frogs--the babies had grown up, and I moved them to larger vivs. I was going to tear the small vivs apart and re-do. (They were looking a bit "messy", and I love to build vivs.) However, I noticed how many isos were in them, and decided not to mess with them! I have lots of leaf litter in all my vivs, and all I have to do is pick up a few leaves, turn them over, and wow! Tons of isos! I just drop a few leaves full of isos in my other vivs every so often, and they really keep going. I don't feed the isos, per se, just mist the vivs as usual. I had frogs in there for over 2 years, so the residual calcium, vitamins, and frog waste must be enough to keep them going. Think I will add some egg shell tomorrow, now that I'm thinking of it!
Pumilio bastimentos, R. benedictas, P. Terribilis orange, R. Imitator Cainarachi Valley, D. Leucomelas, D. Auratus, D. Azureus, P. vittatus, D. cobalts, D.Oyapok, Bombina Orientalis