Watermelon Auto from RoyalQueenSeeds

Mr. Pipi waits for pH tester to arrive... he doesn´t like that the plant isn´t full green. Too much yellow. Nutrients should be present, so Mr Pipi thinks it must be the pH. Also the Stems are very red/purple and even the leafs start to get purple spots. Mr Pipi has no fear, but he doesn´t want to shrink the yield either. Light got cranked up to 100% since ca. 5 Days. Let´s hope it´s the pH, then Mr.Pipi is prepared with some coffee-ground to topdress. But first step probably just correcting ph of the water. We´ll find out. update.pH seems to be 7 so i think thats ok. after defoliation the plant looks better, so my final guess about the yellowing is that the pot could be too small..