I have been using aluminum anodes all around for the last two years. I was told they last longer and are good in the salt and freshwater. Most of the anodes seem to last quite a while (1 plus year) but the ones on my trim tabs seem to only last about 6 months. I assume this is because they are on stainless steel? They crumble apart. I pull my boat out and trailer home typically unless I plan on fishing every couple of days then I leave on the dock. Is zinc better than aluminum? Would I have stray current possibly even though it’s not affecting the outboard zincs?