Hi AP folks, here 2 question, i run a NFT system.
Fish tank is IBC, Biofilter (filled with: bottom - Bio balls, then 3 layers of filterpads on top, and special filter for pump, this filter is of course aerated, total contain of biofilter is300 liter). Fish: 25 - 30 Tilapia, total weight 5,5 to 6 kilo) NFT pipes, 5 meters plant holes: 75.
Last measurment (after cleaning biofilter)
Nitrate: 10 (drop down from 40)
Ammonia and nitrate was always around 0 and 1, never been higher.
Now my first question is about the water coloration. Since 4 days my water changed into dark brown, the smell of water is lightly fishy and smell a little bit old. i cannot see the bottom of the ibc tank anymore. Fish are eating well, 2 times per day, 1% diet. System is running now for 3 weeks, never had the coloration of water before. i cleaned the biofilter and add around 300 liter of new water. Coloration is still brown, here is a pic before and after:
And now my 2nd question....what do you think it is, fish waste or mosquito larvae?
i know the picture is not very clear. many small larvaes swimming around....but i just wonder if this is pooh or eggs?
Well, so far my system is running great, crops are doing super well, all im concerned now is the water coloration, and if my system is going to turn over, even the ph, no2, no3 and nh4 are good. hope to hear from you! cheerio! Ben
A brown water color doesn't worry me but your comment that you can't seen the bottom of the tank is a bit of concern.
The solids I see in the picture just look like waste and solids and midge larva (tiny red worms) tend to hide in the solids or even make little tubes out of them. Midges are annoying but don't bite.
Mosquito larva swim around in the water and are dark. I don't know how well mosquito fish will do in pipes though.
Your system water looks good and healthy to me. The color of your water is due to the beneficial bacteria in the water column and you seem to have a good population.The water in my systems looks the same. A slight fish smell is ok. The midge fly larvae(red worms) will eat the decaying organic stuff in your system which is a good thing. Midge flies look almost identical to mosquitoes so be sure not to confuse them. Mosquito larvae are not red and swim in the water instead of sitting on the bottom
You need to plant out your system now!!!!