I've experienced a number of problems with my tank and I thought maybe someone here could help. In the past couple weeks I lost all my badis, a number of shrimp, and just today I lost my beloved halfmoon betta.
My tank is a 12 gl fluval edge and is close to 3 years old. It's planted but not too heavily. I do 30% water changes every week. For the water change I use 2gls of tap water (that rests overnight and add 2 drops of Prime) mixed with 1 gl of RO water with 1 little scoop of GH Up. I also add 6 drops Phyton Git, 32 drops Flourish Potassium, and 2 pushes of Green Brighty Step 3 to the mix. If I trim plants I add 7 drops of Green Gain. I dose potassium every other day and two pushes of Green Brighty Step 3 every 3 days. Due to the tank's age, I have added Iron Bottom to the substrate.
This routine has worked for me but recently I started to notice that plants appear stimulated by the water change and photosynthesize for 24 hours but then stop and I do not see anymore oxygen bubbles being released for an entire week.
co2 is administered via an inline co2 diffuser at 1 bbl per second. For light I use the Fluval Edge's system that came with the tank plus a Padlite with two LED strips (one white/one roseate). The co2 drop checker always turns yellow just after a few days, indicating a dangerous accumulation of co2.
The temperature is kept steady at 76F. In the past year, I'd been getting cyano blooms and I have added a product called Blue Green Slime Stain Remover by UltraLife every now and then and it seems to do a good job as cyano disappears for 3-4 months but then comes back again.
Just after my betta died I did a number of tests:
any ideas what's going on? any tips to stabilize my tank, bring PH to 7.0? why do plants stop photosynthesizing?