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I have couple of issues on my tank , my marine land led light tends to to get hot , have little spots of algae on my rocks, what is a good filter can hang on back for 75 g , have two , would love to have one?
I use a quietflow (think its called) filter
Try the fluval brand. They're awesome. You may have to read into the set up a little, but awesome filter.
Reduce the amount of time each day that the lights are on to stop the algae from blooming more.
Which model LED? Mine can get warm, but not enough to think it's causing damage.
For hob's for larger tanks I think 2 smaller hob's are better than one large one if they have the same GPH since you can do maintenance on one of the filters every-other week without much of a problem