Albino African Clawed Frog died this morning, what from? Pics included

[craig121]

Am not condeming you but its quite possible the tank was at the lowest limits to capacity the frog
General rule min 10gal per frog but thats with strict feed and clean regime" the gravel should be hoovered almostEvery other day or dont bother with gravel" the filter should only be rinsed out with old tank water during each water
change" its a shame whats happened if you managed 6 yrs you certainly were not neglecting the froggy but sometimes
the tank just gets over challenged then the bad bacteria arrive then the issues