It's been ages since I've updated this thread, but one thing leads to another and I keep forgetting to post photos. Thanks Fishboy and Hilde for your comments and reminding me to get my act together.
Now that the tank's been flooded 6 months or so everything has started to settle down and grow without too much fuss. Algae continues to some extent, but I think I'm holding my own. Lately a lot of my aquarium time has been occupied with breeding the pygmy cories so the pruning etc on my 20g has suffered a bit.
Starting with cories in my 10g:
Last time I posted I was having trouble with predation by ostracods after putting eggs in my vacant 10g walstad-style tank. I eventually overcame this by suspending a metal coffee filter in the top of the tank and placing the eggs in there. The mesh was too small to allow the ostracods to get in, and once fry are freeswimming they seem immune to predation and can be released into the main part of the tank.
Here's a freeswimming fry in my 10g, probably about 2 wks old
Slightly older fry:
And young adult
I apologize for the quality of these images, the fry are so small and fast moving that it's hard to get a sharp photo in the very low light of my 10g tank.
Since this rearing tank was a little dull with only the immature cories, and I was keeping the small fry split off anyway I decided to add this little guy for some colour:
He's been a great addition, as he doesn't seem to bother fry longer then a couple of mm, he completely wiped out the ostracods and is happy to eat the same microworms that I feed the growing cories.
my breeding scheme seems to be fairly successful at this point and I've raised some 15 fish so far. I think I could do a lot more as there are still tons of eggs appearing in my main tank, but it's time consuming to take care of the little ones and not so exciting now that I've managed to rear a few batches.