Appreciate the feedback
@ceg4048 and apologies for only replying now. I will be honest and say that I am very inexperienced (only been doing this for a year) and scrapped the tank that was suffering the most and started anew but have got an air-condition now so the temp of the water is pretty much always between 22 and 24 C. I fully understand and was aware of the solubility of CO2 at high temps, hence me asking this question. Let me explain my setup to you:
1) ADA 60P with Amazonia v2 soil (incl Powersand base layer).
2) A canister filter with good flow around a central submerged "mountain" scape. It's a Fluval 407 filled with Seachem matrix and two pouches of Seachem purigen.
3) Daily fertilisation using the estimative index. Monday (macro), Tuesday (micro), Wednesday (macro) etc... rest day on Sunday. I actually do two water changes of at least 50% per week (one on Wednesday and another on Sunday. I used the website rotala butterfly to create my own ferts (KNO3, KH2PO4, MgSO4 - the macros); (Plantex traces mix - the micros).
4) Pressurised CO2. A CO2 Art regulator/solenoid, Sodastream bottle (I can't get bigger bottles in my area). This is all on a timer - on at 13:45 and off at 22:00 (hour before lights out). I use the bubble counter on the regulator and it is 3 bubble per second currently. Even though it is only a 60p I use an inline diffuser.
5) Lighting is x2 AquaEL Leddy Slim (1200 combined). I can't set the intensity on these. Lights go on at 16:00 and off at 23:00. The LEDs are 33cm from the substrate in the tank.
6) I use only RO water, but to be honest after water changes my TDS is often sitting at 200 - 250 a day or so after my water change so I am not sure if I should remineralise? Maybe some advice there? I use a product called Dennerle GH/KH+ and add about 3g of that which says that it adjusts the GH and KH by 1 degree.
7) After a water change I add potassium carbonate to raise the KH by 2 degrees. I am trying to prevent large swings in pH?
I always vacuum as much of the substrate as possible and rinse the filter once a month in tank water that I changed out. Despite this, I am experiencing a lot of green spot algae, which I read is either a dirty tank or low phosphates. I can't think how much more to clean so I am going with low phosphates?
I have attached some pics.