Hi - I'm sorry for the loss of your little girl, I really do feel for you

You're getting a brother and sister you say? Make sure you get the male neutered else they'll be inbreeding which is an avenue best left unexplored to be honest.
Now ... while I do know how much you're hurting at the minute, I've lost suggies in the past so I DO know how you feel. I feel I MUST say this so your new pair are as healthy as they can be and so this is avoided in the future.
Your diet is lacking in alot of essential nutrients (I saw your post on the other forum), Popper was a little underweight, how old was she? We CAN help you with this, and you mustn't think we're blaming you for Poppers death, we just want to HELP. So the best thing you can do now is to listen to our advise.
You need to look into diets more in depth, there is a dietary page on here, go through the list of popular US diets, or if you prefer I can email you a weekly diet sheet.
In every diet regardless of whether it's bml, pml or any other, there NEEDS to be a variety of fresh fruits and veg, a protein source, a calcium source and a multi vitamin supplement. They form the basis of a very simple yet effective diet.
What happened to Popper is something that affects mainly poorly gliders, we've seen it a few times here in the UK this year (on this board) and they've all been suffering from either a poor diet (in Phil and Lil's case, but Helen is NOT responsible for this!), or they've been under the weather as in Zippy who's face exploded into an awful infection just shortly afterwards, and my little Tinkerbell, it's a long story, I just don't know what was wrong with her

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To get the most out of your gliders you need to look at the diet you're feeding and be honest with yourself, the only ones that will suffer are the future suggies if you don't. We're happy to answer any questions you may have regarding diets and I think we're a patient bunch, so please make the most this board and give your suggies the diet they deserve.