Cycle -noob question

necbov

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Hey everyone,

Question is how my cycle is going ?!
When to clean the filter sponge in the sump and when to stop the bio s.

Cube 45x35x45 91Litre

30day of cycling.

1. day filled the tank with freshly made salt water af rock an af bio sand and add 2 flakes and 1 drop af bio s
2. and 3rd bio s 1 drop
4. day 2 flakes and bio s 1 drop
5.&6. bio s 1 drop
7. 2-3 flakes and bio s 1 drop
8.&9. bio s 1 drop
10. 3 flakes bio s 1 drop
11. test 0 ammonia 0 nitrate 0 nitrite
Dose 2 ml liquid ammonia 6% and bio s 1 drop
12. test 0 ammonia 0 nitrate 0 nitrite dose 2ml liquid ammonia 6% and bio s 1 drop
13. 0 ammonia 0 nitrate 0 nitrite dose 2ml liquid ammonia 6% bio s 1 drop
14. test see photo, seeing some ammonia and NO2, bio s 1 drop

15.&16. Bio s 1 drop
17.. test see photo , ammonia also no2 and no3 (did api ammonia test also) bio s 1 drop

18.&19.&20. Bio s 1 drop
21.. test see photo , less ammonia ,slightly more no2 and more no3

22.&23. Bio s 1 drop
24.. test see photo , less ammonia ,slightly more no2 and more no3

25.&26.&27. Bio s 1 drop
28.. test see photo , tiny or 0 ammonia , more no2 and more no3 Bio s 1 drop

29.. test see photo, 0 ammonia, stable ?! Or more no2 , more no3

Photoroom_20260630_094345.jpeg Photoroom_20260630_095216.jpeg Photoroom_20260630_095711.jpeg Photoroom_20260630_100842.jpeg Photoroom_20260630_102318.jpeg Photoroom_20260630_102658.jpeg
 

Kooma

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Looks like your cycle is done. Add 1 fish and test over a week to see how the tank responds.
 

Gumbies R Us

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Cycle looks done to me!
 

EnterName

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I agree with @Kooma and @Gumbies R Us, nitrification seems to be established in your tank. You can either start with the first living creature in your tank like a fish or add something like 0.2ppm ammonia and see how long it takes to be nitrified again.
 

Fish Fan

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I don't think you're cycled well enough for livestock yet 🙃

I don't see where you got your initial dose of ammonia up to somewhere around 2.0 ppm to get the cycle started. I see where you've added "2 flakes" of fish food here and there, but that's not enough, and then you started to use an ammonia product, but you need to add more than two mL's for a 90L tank. The ammonia should have been around 2.0 ppm on day 1 to start the cycle.

Ignore nitrite, you don't have to test for or worry about it at all in saltwater.

I would add enough of the ammonia today to bring the concentration to about 2.0 ppm measured on your test kit, not just how much the bottle of ammonia says to add. Then, check your ammonia again in 24 hours. If your ammonia goes from about 2.0 ppm to <0.25 ppm in 24 hours, then you'll know you're good to start safely adding some hardy livestock 🙂

Good luck!
 
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necbov

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I don't think you're cycled well enough for livestock yet 🙃

I don't see where you got your initial dose of ammonia up to somewhere around 2.0 ppm to get the cycle started. I see where you've added "2 flakes" of fish food here and there, but that's not enough, and then you started to use an ammonia product, but you need to add more than two mL's for a 90L tank. The ammonia should have been around 2.0 ppm on day 1 to start the cycle.

Ignore nitrite, you don't have to test for or worry about it at all in saltwater.

I would add enough of the ammonia today to bring the concentration to about 2.0 ppm measured on your test kit, not just how much the bottle of ammonia says to add. Then, check your ammonia again in 24 hours. If your ammonia goes from about 2.0 ppm to <0.25 ppm in 24 hours, then you'll know you're good to start safely adding some hardy livestock 🙂

Good luck!
That’s what I’m thinking, total I put 6ml ammonia 6% (pure ammonia) like double the amount for my tank and I dont remember if I ever see 2ppm to tell you the truth . So from what I’m thinking is wait a few days for ,ammonia is already 0 in all of the test there was ammonia except from 2 or 3 days ago, no2 also to get 0 and no3 to go higher. I’m already day 31 so I have time with me 😂
If I’m the next week it’s the same I think I will do the test to put ammonia 2ppm(compared with Salifert test). If it’s not cycled I will probably reply to your post again asking for help 🙏
 

Fish Fan

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That’s what I’m thinking, total I put 6ml ammonia 6% (pure ammonia) like double the amount for my tank and I dont remember if I ever see 2ppm to tell you the truth . So from what I’m thinking is wait a few days for ,ammonia is already 0 in all of the test there was ammonia except from 2 or 3 days ago, no2 also to get 0 and no3 to go higher. I’m already day 31 so I have time with me 😂
If I’m the next week it’s the same I think I will do the test to put ammonia 2ppm(compared with Salifert test). If it’s not cycled I will probably reply to your post again asking for help 🙏
I would suggest adding enough of your ammonia to bring the concentration to about 2.0 ppm measured on your test kit. Don't just add the amount it tells you to on the bottle of ammonia, verify it with your test kit. Then, check again in 24 hours and if the ammonia is less than about 0.25 ppm, you're safe to start slowly adding some hardy livestock. If it's above 0.25 ppm (and I suspect it will be), then you need to give it some more time to come down.

You can safely ignore testing for or worrying about nitrite, it is non-toxic and not an issue in saltwater tanks. Just watch for the ammonia to go from 2.0 ppm to about 0.25 ppm or less, and for nitrate to be increasing.

Good luck, let us know how it's going!
 

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