Assuming your tank is a "standard"ish 125 litre dimensions, which I would guess to be around 90*35*40 cm, then in terms of size, it's pretty good for the fish sizes and groups you list. Overall, this is one of the better stocking questions I've seen on here in a while!
In terms of total number, that's more difficult as I don't know any of the set-up details, like for example, how will you cycle it, what filter will you have, will you have plants, etc. If it was my tank, then I would not have a problem with going for that stocking.
Another thing to keep in mind is that the rams and Corys will really benefit form soft water, while the Bettas and Pseudomugil have a slightly more neutral preferences. Also, some people recommend that blue rams are kept in warmer waterers, while Bettas in cooler waters. Myself, I have not had problem keeping the two together at around 24 C.
I'll seed the filter with my mature media from my 64L which will be closed down so my new tank can go in its place (the stocking in my first post will be an eventual thing).
This is a really personal preference thing, so I'd stock Corys, then some
After because the more water you keep, the less changes there are of problems from parameter changes.
Pretty much! I always wonder why tests are not sold as "ammonia, nitrite, KH and GH" and "nitrate and pH", as that is the order of importance for test kits, really…I do have some old test strips but I'm guessing their readings would probably be useless?
Because the water hardness in your tank can drift from that of the tap water quite a bit over time, which is also why one would want to test the hardness too, as hardness is what one normally wants to know anyway, not the pH. If you want to know why hardness is important to fish, read about osmoregulation.Yep, me too! I rarely use my pH test, can't really see why you'd need to use it more than a few times anyway!? Could I ask why you wanted the hardness readings?
