Try adding CO2 to knock the pH to 6.6 and then watch it, also how long does it take from the start of the light period/CO2 addition to get it to 6.6? Keep the Diffuser clean and soak in Bleach or peroxide often to clean it and then rinse, add dechlorinator etc.
Do not trust the drop checker, stick with relative pH drop.
When temp goes up, the CO2 goes DOWN, same for O2.
plant demand however goes up for both CO2 and O2. so if you add a lot at say 75F, then it's 85F, it will be less.... and the plants will demand more.
HC should grow tightly along the sediment.
That stuff looks weak and lacking CO2.
Shrimp, that which cannot be killed. They are like cocker roaches.
Water changes, good CO2 and watching plants/livestock, those are the most important things. I do 2-3x a week 50-70% on new tanks till they are fairly well filled in, then you can back off.
Thanks for the reply Tom. When the lights are turned off, PH is around 7.7, but once they are turned on with the Co2, it takes about 2 hours for the PH to drop to 6.6 (a rough estimate on time). Since I purchased the Pinpoint PH monitor, it made it 10x easier for me to monitor the PH fluctuation. I am still debating on getting an Apex Jr system. This way I can monitor my tank while im away, have more control over timing, etc etc.
Temp is pretty stable around 78-79 depending on how hot it is outside.
I've been having some issues with the Nitrates showing zero while using the PPS-Pro method, so after discussing it with some members, I decided to switch to the EI method.
I created some pre-mixed bottles, that I hope will last me a few months, using the following mix (Dosing 5 ML)
Bottle 1: (500 ML)
28g K2S04 (went less on this, since I was told I can get K from KN03, KH2PO4)
Bottle 2: (500 ML)
87g Plantex CSM+B
I left out MGS04, since my GH is around 8. I normally use RODI water, but I have stones in my tank to bump the GH up. If I notice my GH is too low, I'll start dosing this. Until then, I'll leave it out
Sunday, Tuesday, Thursday (5 ML Macro)
Monday, Wednesday, Friday (5 ML Micro) Plantex
Water Change on Sundays.