is this red slime?

Looks more like diatoms to me. Very common in new set-ups and it will pass of its own accord if you can be patient. Cyano comes in several colors, but a dark maroon red is the most common.
 
I agree it looks like diatoms, its a good indication that your snails are eating it.
They wouldn't be eating cyano (red slime).
 
Thank you , the tank has been up for 6 months

Ph 8.25
Temo 77.5
Po4 0
No2 0
No3 .5
Ammonia 0

Whats the slimey lookimg stuff on the rock by the mp10?
 
Thank you , the tank has been up for 6 months

Ph 8.25
Temo 77.5
Po4 0
No2 0
No3 .5
Ammonia 0

Whats the slimy looking stuff on the rock by the mp10?

If yo mean the long stringy stuff, its hard to tell from the video, we might need a still of the area you mean.
 
It does appear to be filamentous and its is slimy looking. It looks like you have yourself a case of cyanobacteria. This will mean that your nitrate and maybe your phosphate numbers are not really showing you how much of either are in play because the bacteria are consuming it. Co2 will also have to be gotten rid of.

1. Start running GFO or start running more of it in a reactor
2. Start using Kalk to eliminate Co2 and elevate PH
3. If don't have anything in the tank that needs lights, turn them off until its all gone.
4. Increase the frequency of your water changes and/or skim wetter with your protein skimmer

1, 2, and 4 should be permanent. Then go buy chemiclean and follow the instructions. When done return to doing 1, 2, and 4.
 
Ok right now i am running gfo i will add more. I do water changes every week , 10 gallons i only have a 75g tank. How are my nitrates so bad i only have 4 fish and dont over feed. My skimmer is rated for 150 gallons i thought 8.3 was good for ph. And how do you use kalk ? Thanks for your help
 
I shut my white leds off and leff my royal blue on should i shut does also? I can even just leave a strip on with only blue and green and u/v light .
 
kalk is mixed at about 3/4tsp per liter(quart). Some people use more, but that is about all I can get dissolved in that amount of water. It is normally dosed via an automatic top off system as your make up water as water evaporates from your tank.

The reason for the slightly elevated PH (maybe 8.4 in your case) is purely because we want to strip Co2 out of the water which is the preferred uptake of cyanobacteria and we want to use kalk to do it. The PH will give us an indicator that we are doing that.

When you are mixing kalk (pickling lime) or the pure stuff from BRS, don't get it on your hands it has a PH of about 12 and will burn your hands. Mix as little as possible without pulling bubbles into the water and don't use a pump for mixing. Over mixing will cause kalk to pull Co2 out of the air instead of out of your water making it useless for our use here.

I am currently running a little over 300 gallons with 2 clown fish (just about to start stocking), if I weren't carbon dosing, the system would stabilize at about 50ppm nitrate and that is with constant water changes totaling 50% per month. The increased water changes will do nothing or at least very little for the nitrate issue, it is because we are about to kill off a lot of cyano and we want to get the results of it out of the the aquarium as quickly as we can.
 
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