could still have ich in the gills. how long did you treat the tank. Ich should be treated for a couple of weeks. I know normally you would raise the temp to speed up ich...but it also makes it harder to breathe. Might want to lower the temp a little.
I second that you should not mix cichlids like this. The jewel should be kept alone. The water requirements would not work. Some of the fish need hard water and some need soft. Are you on the ground floor? 75 gallons of water will weigh in at 600 pounds or 272 kilograms. Plus filter...
you could always build your own tank and take it to the next level. It would allow you to custom fit the tank better to your home. You should be able to purchase acrylic sheets cut to spec and then all you need to do is assemble.
true, it does require some effort. But, it is great in between water changes. I use it in a 55 gallon SA cichlid tank. Very messy fish. I use it every other day and it needs cleaned 2 - 3 times for the complete cleaning. I keep a 5 gallon bucket with water and just pop off the filter and...
It will take more then a bottom feeder. They generate their own waste. Manually cleaning is the only way to keep a healthy tank. If sticking your hand in the tank bothers you, use a divider and clean half at a time.
do you live feed? If you do, this may lead to issues. But, I would expect anything you put in the tank to be food. One day you may be late feeding and they will find a snack. ;)
Check for spiking ammonia and nitrites. If you have it, before treatment do a 25% water change. If your fish can stand it, make sure the temp is 78 - 80 degrees. Warmer water speeds up life cycle of the parasites. A little aquarium salts will help heal up any damage from the fish rubbing. Add...