OK, despite spending part of last night and this morning so far trying to figure out what CPDs are, can someone please enlighten me now that I've confessed to my total ignorance?
CPD stands for continuing professional development.
Or celestial pearl danno as Colin has said.
Sorry Diz, I thought I'd written the while name out the first time I mentioned them, but I see I haven't! Too excited.
You can see why I don't want to write the whole name out every time.
Thanks for your compliments on the tank.
I'm probably going to get told off for this, but the stones are ones I found in nature! I put them in a tank of water for a few weeks to see what effect they had on water hardness though (none).
There were some absolutely lovely pink rocks that I now know are called pink alabaster and are soluble in water lol so I couldn't put those in.
The twigs are heather, found on a hillside, already all dried up. I looked into it and heather are apparently fine. I tied some Java moss to them.
There's a plastic plant pot in there too.
Other than that the substrate is soil under (and to a lesser extent on top of) aquarium sand.
I think I need some floating plants as the next species of fish I want to get, likes them. The plants I have are really easy, sometimes they float up to the top and I just stick them back in the sand. All except the cryptocoryne which is new so I've no experience of that yet.