Thanks Waterdrop.....Noted!
So no water change for 8 days ....Ammonia 0, Nitrite 0, Nitrate 0 & PH remains at 7.8. (Timer used today!

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My water hasn't stained any futher from the mopani.
Ended up in a different fish shop yesterday when I was out and about....saw a lovely little algae eater called Otocinclus affnis which I think I will get in a few months time (for when I actually have algae)....so including him in my stock will mean I have to cut back on something else.
You know, I might just leave with my current 6 Cardinals, the Otocinclus and two fish that grow to about 5cm at maturity, yet to be decided. I think that would be comfortable enough for the tank?
I would really like a female betta, they are gorgeous, I think I prefer them to the males, but if get one, thats it for the tank... I've read up that I can't put two female bettas in together...Its either one betta on it own, or four bettas in a group to stop bullying. Plus its quite hard to put another fish in with them because of their aggressive character.
So, one female betta (or two small co-habiting fish instead), six cardinals & one otocinclus...that might be my final stocking for this tank.
Anyway...more to ponder.
Bblou....glad to hear I'm not alone!
