maxima trouble

[royvoss]

purchased a maxima, he attached to a rock wihtin a few days. was doing great, over night went down hill. he gaping and retracked. not sure there is any hope. did a quick chem check . everything seem fine. only thing i can think off the current was too strong were i put him.
ph 8.1
salt 1.026
alk 136 ppm
cal 414
nitrates and trites undectable.

2 - 250 watt mh
4 54 antinics.