Yea, it couldn't hurt to vary the food source a bit. And I still suggest the bloodworms as a great alternative. But, I think that's more of an optional "optimize health" tip than an "address your problem" tip.
The stability of the pH is definitely important, and I don't suggest doing anything drastic, but "used to it" isn't the same as "healthy for it". Your kH levels aren't low, meaning the pH is probably well buffered/stable. But, your ammonia is going to be more toxic to your fish at that higher pH level. (Note: I can't comment at all on the nitrate, I know nothing about it) So, if you don't very regularly change the water (happens to the best of us) it's worth looking for a long-term solution to the pH problem.
So the big question is why the high pH? Is this because of the water quality in your region, or because something in your tank is causing the pH to be high? To figure this out... next time you get your water checked, get your tap water that you use for water changes checked as well. BUT, and this is important, wait at least 24 hours or the reading will not be accurate. Now, if your water has a pH and kH of, say 6.5 and 1, respectively, this might indicate that something in your tank is the culprit. For example, if your gravel has coral or you heavily decorated with coral that could be the issue, and I'd suggest taking that out (gradually, monitoring changes). The driftwood is good - helps lower the pH slightly.
As far as your filter... Aquaclear is great and I can't imagine why you'd need 2 foams. Just make sure that every once in a while (I do this about once a month) you squeeze it out to "clean" it in dirty water. You want the foam, carbon, and biomax but only need one of each. For an extra boost, you can get a small, cheap whisper filter and change out the filter every 1-3 months. I've done/do this in both 10g and 20g because I have giant apples snails (HUGE bioload) and am guilty of infrequent water changes.
Other things to look into are plants that are specifically known for absorbing calcium and lowering the pH, and (if you don't already have this) a gravel vac to help you suck up waste during water changes. I promise there are easy ways to address pH that don't require being an expert and won't cause a huge pH crash.
And you just might find that addressing this helps with the coloration/health of their tails!