Hi guys, this will be a long post so apologies in advance. I have a 340L Rena tank, 47"L x 20"W x 24"D, it houses 6 Cory's and 48 Tetras, (Congo, Neon, Purple Emperor and Green Flames), at the minute I have about 1/3rd of the surface covered in water lettuce then a piece of bogwood covered with anubias and java fern, all these plants are doing fine but when I introduced amazon swords, ludwigia repens, ceratopteris thaticroides, (I think), and a load of cryptocoryne wendtii, (again I think), things went wrong and most of them started melting, this was late May so I moved them to a smaller tank and have been dosing easycarbo and EI salts ever since and most of them have come back now although I did lose a few. Around 4 weeks or so back I also bought 5 bunches of giant hairgrass, (eleocharis montevidensis), which is supposed to be an easy plant to grow but within a week they had all melted and I lost every one of them, (local fish shop is replacing them for me). Now I have to say that I only have 2x T8 tubes for lighting which I know is totally insufficient but I can't seem to find anything that looks suitable for the depth of the tank, I'm thinking that even a fitting that only covered about 3ft would be ok as the rest is covered in water lettuce as I said, I will probably have to replace the tanks lids with clear polycarb or something as some of my fish like to jump, any recommendations would be gratefully received. Thanks.