Tank stats: 20G Long 200gph filter no air pump no heater usual range 65-70 deg F (fluctuates throughout day) 1in of large rock, undyed, as bottom 2 decors that they can hide in 4 plastic plants for additional cover/decoration Test Readings (done with API liquid tests): 8.0 PH (how can I lower it to 7.5?) 0.25 ppm Ammonia 0 ppm nitrite 10-20 ppm nitrate Occupants: 1 common goldfish (won from a fair) 1 Comet goldfish (store bought) Diet: They are fed twice a day, and only for a minute each time. First time is at 6:30AM, second is anytime between 5-10pm (depending on my work schedule). They are also fed in separate areas of the tank to make sure they don't miss out on food. SUN AM - soaked goldfish flakes (Tetrafin), generally one pinch per fish SUN PM - freeze-dried shrimp (omega one) , cut & soaked for easy eating MON AM - soaked small pellets (omega one), ~3-5 per fish MON PM - earthworm on a stick (generally bought from store, and i wash them in a sample of tank water before i feed them), only as much as they can eat in 1min. i made sure that they don't get close to the stick and hurt themselves with it TUES AM - blanched spinach (fresh), generally about my thumbsize is torn off and they eat about half of it each within the minute TUES PM - shrimp again WED AM - treat time! very small amounts of strawberry, they love it! WED PM - bloodworms THURS AM - Flakes again THURS PM - lettuce, or whatever vegetable I happen to have on hand FRI AM - Pellets again FRI PM - 1-2 peas per fish, depending on the size of the pea. they are frozen peas. i boil them for quick thawing, and until they are almost mush. peel off skin, cut in half, and feed it to them SAT - skip All food is soaked in a separate cup of tank water prior to feeding I didn't know about the tank cycling before I put goldfish in. I've had them for about a week or so and they've been extremely active, following each other around the tank (not "flashing" though, mainly just gliding). The love each others company and never stay on separate sides of the tank for long. Lately, my common goldfish has been sitting on the bottom of the tank and barely moving all day, except when you feed him. He'll get active when and after you feed him, and he'll swim around for an hour or so before he goes back in his little hiding spot and just lays on ground. I know the tank is a little small, but so are they and I am moving in a month, so I didn't really want to get a huge tank that we would have trouble moving. We are planning on getting a large tank before they get bigger. Skipper (the common goldfish) doesn't have any of the physical symptoms of ick or anything of that matter. He still has a super bright colour, no distortion to his normal body frame, no lines, spots, etc. The one thing I did notice is he would clamp his fins from time to time as he was laying on the ground. I did a 30% water change a few hours ago, and ever since he has been his usual self. I use Prime for a dechlorinator+. Do you think the water needed to be changed, or is it something else that is wrong with him? I'm just scared he will go back to bottom sitting and I won't know what's wrong and he'll die.