I think you nailed it. Ive changed my water with a warm water directly from the tap for years and never had a problem... Then again never had this large of tank. That and the daily watrer changes. Im going to cut down the water changes and use cold water from now on. Also my lighting is strong and is on a 14 hour cycle... Im def going to reduce that.
Itsokay to refill a tank with cold water when doing water changes? I always get my water at tap near 80 or same as tank temp then add it, am I doing it wrong? I thought if I added it cold...it'd shock the fish?
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It will shock the fish if you use only cold water, that's why I suggested cutting down the water changes and using Crystal Clear or a similar product to clear the tank. I personally just run the water for awhile to clear the lines as I don't pay for water

. I also make sure I'm using a lot more cold than warm, as long as the temperature difference isn't too great I'd say more than 2-3 degrees from your tank the fish will be fine. Especially in larger tanks as it takes time for the water to circulate and then the temperature change winds up being very gradual. You can always tell if your using water that's too warm as it comes out cloudy out of the hose due to the temperature difference. The water your putting in should be as clear as the water that's already in there, I use my hand to tell, but I'm one of those guys who doesn't really follow the rules a lot of aquarist's do. Either I've been really lucky or I'm doing something right.
There's actually a ton of suggestions I can give as far as people getting crystal clear water. I don't use all of these, but if your really determined to make sure you've got crystal clear water they'll all help toward that goal.
1-use Crystal Clear or a similar water clearing product. Do not use a pond water clarity product though, I've tried several and it was counter productive in a tank.
2-make sure your using a really good micron filter pad. This is what gets out all those small free floating particles.
3-a good diatom filter is excellent at filtering small particles out of water. You can run these guys after every water change and they'll clear your water in an hour or 2. Do not run a diatom filter consistently, they weren't made for running like that and you can cause them to wear out prematurely.
4-Purigen is also a good filter material for clearing water and the only one that's both biological and mechanical filtration in one.
5-surface turbulence also helps in gas transfers and in my experience also helps in water clarity I like using spray bars in my set-ups.
Also remember that mechanical filtration isn't the same as biological and crystal clear water doesn't mean good water quality. So make sure that you don't focus on mechanical trying to clear your water and forgo biological.