Quick update.
Things seem to be improving slightly although I still use EC daily. As an experiment I did away with the reactor that was powered by the internal filter and just added the diy co2 to the air inlet pipe of the internal with excellent results, I was quite surprised. The sera internal came with a little spray bar and a couple of elbows so I pointed the bar vertical down one corner, the co2 sprays out tiny bubbles which are actually finer than comes out my glass diffuser 😱 These drift about and cling to plants also I get the added benefit of a bit better circulation in that corner now the reactors removed.
I now have the pressurised glass diffuser in one corner and the diy internal in the other. I've even managed to get the BBA working in my favour, I positioned the diffuser under a heater where the control end is covered in BBA which I don't mind as it softens the edges and looks more natural. The tiny bubbles rise up and cling to the BBA holding them in the column for longer 8) That'll teach BBA to try and out wit me 😀
I'm getting better flow around the tank generally after some re-arranging of plants and a couple of good thinning out, I am still concerned about the flow though, after cleaning my glass and observing debris floating round the tank I can tell there is still a couple of dead spots or poor flow areas.
Considering buying a Nano koralia for the back left corner to improve the situation but have a couple of quick questions, I see a few people saying that the new ones are better as the old ones were a bit noisy but which is the newer version? I notice that the grill from the pics I have seen are quite large openings and the impeller looks to be exposed and visible has anyone had and problems with shrimp investigating into there with antenna if that's the right word?
Also my LFS guy reckons that in my 3x2x2foot approx tank that even a nano would be well over the top for a planted tank movement wise as I haven't seen one in action what do you think?
Finally the ones I have seen on you tube were probably bigger models but they do look a bit bulky the specs say 2 and 3/4 inch but not sure where they took this dimension.