Thanks
@louis_last - OK, so I’ve done a 95% water change this morning - the colouration of the water didn’t seem to have affected the Moina population to be honest - there are literally thousands of them now I can see them in the clear water.
You are probably right in not harvesting too early - it’s difficult to know what the right population is - it’s a bit unnatural to see so many individuals in such a small amount of water. I do use a fine brine shrimp net to harvest though, so I definitely a get mixture if individuals from adults to babies.
It’s definitely not lack of light on the Chlorella - the AI Prime I have over it is a light cannon, and it’s running at 100%. I probably wouldn’t run it at that level on a 400mm deep planted tank. It’s probably 10 times the light that was over the original Chlorella culture bottle.
Also, the green layer in the base of the tank wasn’t settled live Chlorella, it was there before I started adding the live Chlorella. It was mainly snail poo - I’ve seen the snails ‘producing’ it in long strands. There may have been some of the dried Chlorella that had settled too, from when I was feeding that with the yeast.
It’s perfectly plausible that the bacteria - if that is what the bloom was - consumed it, but it’s still pretty amazing that it disappeared in the space of two days.
I have the sponge from the new bubble filter currently ‘maturing’ inside my main tank canister filter. I’m not sure how long I should leave it in there though? However once it’s ready, I’ll add the filter into the Moina tank to see if that adds some bacterial stability.