Update: pointed one pump downwards to the middle of the tank, that made the Tonina happy, just have to cut and replant them to loose the unsightly bits. The Mayacca isn't thriving in the back, still some whitish points, and gathering some green filamentous algea, which are on on all fineleaved plants btw. Redirecting the flow, and using my own homemade CO2 diffusor seems to stop the BGA, so that is good. CO2 is at 30ml/min🙄 (inverted syringe method) and i put some lid-like structures on parts of the sump. The Myriophyllum is almost lost, no growth and some green filamentous algea (like Cladophora). You can see little tufts if these algae on the foreground too, where they are attached to a few small remnants of tenellus. There are no algea of this kind on the other plants, only on those "in trouble". Wil still have to try some other plants like Potamogeton gayi and Hydrocleis. I will take out the stones from the right back cornet this weekend to see wether there is a lot of mulm under them.