Peat moss is not good for use in pots for the most part, unless *very* sparingly used
It is almost impossible to rewet once it dries, IME, though the stuff within cactus-mix is generally not the same 'type' of peat that is sold in bulk (think its a 'Canadian red' or something like that - not as 'cakey' overall). I will mix a small amount into mixes for outdoor
-use here when its super-hot/windy to help hold moisture in species that cannot go dry whatsoever, but indoors, I have found the benefits do not come close to the 'risks' of such use. Peat moss is just best avoided whenever possible, IMO, especially indoors where environ is not extreme by any means. Much better to use some 'shredded sphagnum' mixed in or such, but too much by a small margin and soil becomes rather soggy for most species' roots...and plants will be noticeably affected.
I have used the ~Oil-Dri ~calcined clay (which is similar/same-as the DE mentioned) with good results - just be certain to sift out the 'fine' particles for best results
Light 'fluffy' soil-mix will give the absolute best results, indoors or out - length of time between waterings is not an indicator of soil's usefulness by any means
Fwiw, 'Turface' (made by Profile, Inc) is now available widely from box-stores under a number of 'brand-names' at ~$15 or less/50# bag with ~30# usable post-sifting-> just look for the 'Profile' logo somewhere on bag
It is usually called 'soil conditioner, and works *great*.
I have done a kind-of experiment over the last few months, and have gotten *outstanding* results from 'light' mix compared to 'dense' mix (with peat added) - the dense mix actually led to demise/failure-to-thrive of several different species (coast redwood, Acer palmatum, Gymnocladus dioicus and Thuja plicata off top of my head) while the light-mix trees (all grown from seed started this Fall) are outstandingly vigorous and needing repotted ASAP due to rootball being too dense now!). I wish I had not even bothered to compare the soil-mixes as I could've had lots more great trees instead of tossing a few dozen worthless pots
But now I know for sure