This is why all of your equipment in your tank should have a pre set inspection date you set. I keep every peoce of equipment in my tank on my calendar. Some alawma go of weekly to look at some montly, and some every 6 months. The idea is to understand that everything in and around your tank is in a slow state of corroaion and decay or efficiency decreases the longer maintance is avoided. The most important thinga to always pit on your scheduel are things that habe unatural intwrfaces between two things that would not normally go well together. So in your preinds case... water and a high voltage lightbulb that is submwrged behind a quartz glass. Definately needs to be checked every few weeks.
Its a good habbit to look at things we take for granted carefully, seals, gaskets, the rubber sheath around wires (with enough salt exposure it stops being rubber and becomes brittle) sometimes its good to do a full inspection on something, not just clean it and hope that its working properly.
