I've been busy at work lately and have cut back on water changes. I just did a 4 gallon tonight and it's probably been 2-3 weeks since the last. My tank has a lot of plants in it also. As for over feeding, I don't think I'm anywhere near that. Every other day typically I switch out feeding them Bioplus (level spoonfull) and Specialty CRS food. I don't even feed them a whole strip of that CRS food either, maybe 2-3 1/4" pieces I break off the strip. They eat everything I feed them also. As for remineralizing the water, I have those mineral rocks in the tank and they keep it around 200-250 TDS. If I drop the TDS below 200 I have Bee Shrimp Mineral GH+ to add to the water. Not dosing anything, 30 gallon tank with probably 30 adult CRS and RCS mixed with 25+- baby RCS.
I'm gonna do a 2 gallon w/c on Sunday and maybe another one on Wednesday of next week.
It's been maybe 2 months since I've cleaned out the sponge filters. The HOB I just threw out an old filter and added a new one. It has two filter pads in it, I throw one out and rotate the old and new. My plants aren't dying or losing leaves so I don't see them being the issue.