Hi all, I'm wondering whether anyone can advise what's up with one of my plants, I believe it's 'Lobelia Cardinalis'. Seems to be growing 'ok' but I'm seeing this dark patching/mottling on lower leaves. I don't think it's algae as I have two siamese algae eaters in the tank who are very industrious and would have gobbled it up in an instant, no algae built-up elsewhere in the tank either. Water parameters - 32L of water in a 40L tank. Lowtech CO2; Soda bottle Acid/bicarb mixer, basic diffuser on solenoid control, set reasonably low, comes on 2 hours before lights, drop checker usually dark green at lights on, lime green later in the the day. Cautious about going too hard and killing the fish/shrimp. Tank is not super densely planted. RO water mixed with Seachem Equilibrium and Alkaline/Acid buffers - GH ~10d, KH ~8d, PH 6.9-7.5 Using Seachem Flourish, Iron, Potassium, Excel. Flourish 0.3ml twice per week, Iron 0.4ml twice per week, Potassium 0.64ml once per week, Excel 0.4ml once per week. TDS generally between 800-900. I'm been cautious with the fert dosing as I don't want to over do it initially and create new problems. I was previously using Tropica general fert as per the bottle but the plants were looking unhappy, yellowing, pinholes etc - Lobelia was probably the only one that was looking 'ok' just not growing much. You can still see some yellowing on the 'Cryptocoryne x willisii' in the attached photo but it seems to be greening up gradually. I've been dosing as above for about 2 weeks, plants have generally been looking healthier and growing more than before. So what are peoples thoughts on the Lobelia cardinalis? Perhaps it was previously quite yellow due to lack of nutrients and it's now greening up but I had understood that it should have quite a light green colour. Any advice appreciated.