Notice some water condensation on the edge of new lid after some time, maybe this also happen on old lid and some aluminum gets into tank.l because the corner edge are aluminum cuts.
I get water on lid too no clue by fish or other cause like evaporation. I check anything with magnet like wavemaker mp10 and frag rack for corrosion. I always thought it was lid.
My guess is the aluminum lid I have for tank.
Also I will be trying tropic marine 2 part trace element supplement. Current value not too high. Over 200 is high. My number is not hurtful, gotta be frequent with wc