How about the last quiz?
Ah yes! here are the answers to the "quiz"
#1 Penac W added to boost the water hardness a bit to kH 2. (RODI)
#2 Moved lily pipe outflow to the back of the tank to manipulate circulation of Co2 in the tank to emphasize on the front more - the growth in front left Riccia was suffering a bit.
#3 Trimmed dwarf hair grass to the stub to eliminate emmersed growth.
#4 trimmed any remaining dead growth.