Welcome to AQ Dusty!
You've been very disciplined for the 13 years...
Only one 10 gallon tank!
Quite a few of us are chronic MTS sufferer's...
I'd suggest there are two ways to your soft water issue.
One, buy chemical additives like Seachem's Equilibrium (for gH), Alkaline Buffer (for kH), etcetera.
You can research their website for more information ---> here
They have products for specific kinds of fauna too, like Malawi Victoria Buffer.
Two, and cheaper way, place a bag or coral chips in your cannister filter.
It will maintain your kH and gH.
You will need experiment with the amount of chips required to maintain your water parameters you desire.
Don't forget its important to figure/decide what you want to keep too!
Then what you need to do for the fauna will fall in place or you can get more specific answers to your questions.
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