Water change schedule?

  • We are currently upgrading MFK. thanks! -neo

Doctordetroit

Jack Dempsey
MFK Member
Mar 22, 2016
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120 gallon. Eheim 2217 fluval fx6 and 106 and 2 medium sponge filters. Only have 2 fish in there, 1 8 inch red dragon fh and a 4 inch kamfa. Recently updated my filtration, used to do 20-30% weekly. Light fish load, but messy fish. Don't feed much other than pellets. Should I keep up with the same schedule, or is it not necessary. Also I gravel vac every time I do a water change. Thanks guys!
 
Keep ur wc's as its needed despite the filtration upgrade.

Check ur levels with a test kit. That will tell u if it's enough or not.

If u keep at 50% wc a week and same feedings I suspect it should be fine.

I say 50% cause they are big and will put out some excrement.
 
Appreciate the advice. Being a larger tank, is 50% necessary? If it was a 60 gallon, would you recommend 50% twice a week?
 
Even for a larger volume of water to dilute.

I say 50% cause it's kind of an average number. Plus more water replaced with new water isn't bad.

But you can keep it 20-30% if ur water parameters are in check and correlate to the water change.
 
So check ur water parameters. If they're good then keep doing what ur doing.

If ur nitrates are high then increase ur wc's to 50% weekly. If high still then twice to three times a week.

Cut back on feedings etc.
 
Yes. Make sure u test ur tank and tap water as well. So you know what's going in then with ur wc's there should be a change and adjust.

The goal is ammonia 0, nitrite 0, and nitrate of <50.
 
Yeah a clean and crystal clear tank doesn't mean anything. I catch all my crap literally with filter floss and clean that every other day. Fish pee and poo so you want to do a water change accordingly. I never check my water paramaters I just know from experience with bio load how much I can go without water change.

Great filtration but it'll all be caught by that canister so I would change out the padding and rinse it out frequently. This is why a Sump is so easy for me. I just pull it out of my tray and replace it. Takes me 10 seconds but a canister you have to shut off valves take it apart and all sorts of things.
 
My goal was a nitrate level of 2-5ppm, so I'd do 30% every other day, sometimes more in summer. I had 300 gallons of tanks on each sump, around 1000 gallons in tanks.
Didn't matter if the tank had 2 adult fish, or 200 fry.
Filtration really doesn't do much to eliminate nitrate, only water changes, and plantlife (unless you have a nitrate reactor).
 
I considered going the sump route, my tank is set up in my living room, but I heard they can be noisy, hence my current setup. If I go that route in the future, what size tank do I need for my sump?Based on 120 gallons, and stocking will most likely be larger cichlids. Quiet operation is also a necessity. Thanks again guys
 
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