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Does a strategy must be profitable on all symbols to be considered a good one?  I'm developing a lot of different strategies for each forex pairs and metals and I always got different results.  What's your experience

I've developed an Expert Advisor and calling a custom indicator using the iCustom function. The indicator name is: (ROC)  https://www.mql5.com/en/code/46 When I start the Tester it just keep repeating itself and I don't know why.  Here

I'm looking for the chaikin money flow for MT5, but I didn't find anything here. If exist, can you share the link to download it