Two or three water changes in two months? No wonder you can barely see the fish. With large fish like this, you should be doing 50-75% every single week!
Rocks do not need, nor should be, boiled. They have been known to explode. You are also underfiltered for a tank of that size. You should have two good canister filters on that tank. I would get busy with some large water changes and then get on a weekly schedule of one-half.
Your fish also has some very red gills.
Last edited by Lady Hobbs; 05-01-2013 at 02:32 PM.
++ to Lady Hobbs weekly water changes of at least 50% are a must. Poor water quality is the cause of most fish ailments.
Have you checked the water perimeters on your tank lately? If you have anything but 0 ppm ammonia and nitrites and over 20 ppm nitrates, there is a part of your problem. If you don't have a water test kit, get one asap. do not buy strips. Get an API liquid master test kit
As LadyHobbs also mentioned, the fish had red gills. this could indicate toxins in the water.
It's clear you care about your fish, but you need to get on top of the water changes.
Please read the stickies in the beginner's section on cycling tanks.
30 g FW planted:corys, female ABNP, blue angel, harleys, zebra danios, rummies,
15 g FW planted:2 male guppies, neons, pygmy corys, clown pleco, 4 types of shrimp, assassin snails
90 Gal Journal: http://bit.ly/1vC7gVX
fishless cycling: http://bit.ly/1DARf3T
fish in cycling: http://bit.ly/1ILvcfp
I cannot review your filtration without knowing the size of the sump.
+1 to what others have said. Huge, regular water changes required. I'd be doing daily changes if my fish looked like that. The look like they need feeding up somewhat.
How long are your lights on for?