sorry for not answering you guys earlier, i haven't logged on for a few weeks, too many things to do not enough time!
yes the plant food i used last year for a while was lidl liquid plant food, the brand was Grandiole and it was a liter bottle costing about 2-3 euro. i fed it more or less daily , i built up from a couple of mil to 8 ml a day for the 80 gallons of water that was in the tank, when it ran out lidl had stopped stocking it so the tank was not fed any more, i just bought a bottle of it the other day as it is back in stock again for the summer, but i have not got round to using it yet for anything other than the pot plants about the house. I am not recommending you use this in place of what you normally use,do it at your own risk!!!! if you read the contents of the bottle you will see that some of the ingredients would be considered a no no for adding to a tank, such as the form some of the Nitrogen comes in, i have used it and had no problems, but i have a fairly rigorous water changing routine and i would have what i consider a half decent eye for trouble with plants in general, not that that has always worked in the past!
the only other addition that i used in the tank was easy-carbo for the black beard algae i had, i got lazy and learned to live with it in the end, though it has been starting to really bug me recently so i may have another go at eliminating it.
the spray bar was a bit of move and check, move and check, the two externals are on full output, the tetratec filter spray bar is in three 7-8-or 9" pieces, i cannot remember if it came like that or i added the third one from another filter i had, so each one can be set to spray in a slightly different direction to give the effect i wanted the other spraybar on the jbl is a one piece one and i have that aimed directly onto into the inside upper corner plus i think it is set diagionally again that was just trial and error to get the effect i wanted, one of the things i also had to take into account other than the best effect and benefit to the plants was minimum noise to avoid me suffering the wrath of my better half!
Ithink the only other changes i have made to the tank in the recent past i iadded a pot of the radicans sword, there were three plants in the pot, 2 good and one small, my hope is they will rise above the water and grow hugh once they take off to date they have been pretty slow, but i reckon they are putting their energy into root formation now and i expect to see some good leaf growth soon esp with the sun starting to shine more and give the tank a bit of extra light, fishwise i added a group of 5 splash tetras 1mf 4 m as it turned out, they have been spawning like clockwork every 3.5 to 4 days, fun to watch their behavior Ihave not saved any eggs to hatch seperatly but am hoping for a few survivors in the plant mass. other than that the tank has sort of been a bit neglected with other things needing my attention recently
hope that answers your questions, if not shout and i will get back to you, i must log on more often 🙄