Adding fish in cycled tank.

[Tyler777]

One thing you can do is to move the media from the old filter, if possible, to replacment filter. What won't fit there can got into a bag hung in the tank for a while. You should be OK doing that as you are keeping the bacteria in that media. You also have bacteria in the substrate. Between saving the media, the bigger filters and the substrate there should be enough that if there is excess ammonia, the bavteria will reproduce to cover that in relatively short order. Just keep and eye on things by testing for ammonia once or twice a day at about the same time if you can.

Ok, thanks

 

[Bamf Comics]

You control the ammonia directly. You have two established tanks so you have plenty of filters, filter material, substrate and decorations that can directly transfer needed bacteria over. Move the fish, feed lightly to start and only increase if the testing says everything is fine. If it isn't, a simple water change and putting the food away until it is solves the problem. If you're worried, transfer half the fish from each tank now and wait a week or two for the rest once the tank shows it can handle it. Very little reason to fishless cycle anything once you already have tanks with bacteria beds established you can pilfer from. That's generally a first tank problem. I've got two tanks getting fish today that didn't even have water in them Friday. I've got plastic tubs on standby for emergencies and additional sponge filters if needed for other emergencies. Any time I need extra space now I can have something ready for fish within minutes.

 

[Tyler777]

You control the ammonia directly. You have two established tanks so you have plenty of filters, filter material, substrate and decorations that can directly transfer needed bacteria over. Move the fish, feed lightly to start and only increase if the testing says everything is fine. If it isn't, a simple water change and putting the food away until it is solves the problem. If you're worried, transfer half the fish from each tank now and wait a week or two for the rest once the tank shows it can handle it. Very little reason to fishless cycle anything once you already have tanks with bacteria beds established you can pilfer from. That's generally a first tank problem. I've got two tanks getting fish today that didn't even have water in them Friday. I've got plastic tubs on standby for emergencies and additional sponge filters if needed for other emergencies. Any time I need extra space now I can have something ready for fish within minutes.

That's very smart

 

[Tyler777]

I did a 50 % water change this morning n I'm waiting to test the ammonia n nitrites again.

 

[Bamf Comics]

I just unpacked the new fish and got them into the two 20 gallons that were empty Friday and the tub. Good timing, one of the guppy females had babies in the shipping bag. Little baby guppies are all over the tank already looking for food and fun. Males hanging in the hornwort, the two females are out and about. The other 20 got the Blue Grass, one dead female in the bag but the male is gorgeous if small, the other female is active and a free extra female is on the bottom gasping like she's about to explode babies any minute. Guppys can add excitement rapidly. Here's a picture from before the fish arrived this morning. No reason I should be concerned about ammonia at all that I can see. Aged filter, aged gravel in the tubs, live plants growing, light stock to begin.

 

[Tyler777]

I just unpacked the new fish and got them into the two 20 gallons that were empty Friday and the tub. Good timing, one of the guppy females had babies in the shipping bag. Little baby guppies are all over the tank already looking for food and fun. Males hanging in the hornwort, the two females are out and about. The other 20 got the Blue Grass, one dead female in the bag but the male is gorgeous if small, the other female is active and a free extra female is on the bottom gasping like she's about to explode babies any minute. Guppys can add excitement rapidly. Here's a picture from before the fish arrived this morning. No reason I should be concerned about ammonia at all that I can see. Aged filter, aged gravel in the tubs, live plants growing, light stock to begin.

Congratulations grandpa

 

[Bamf Comics]

I was right!!!! The Blue Grass female that was on the bottom gasping is spitting babies all over the place. The Purple Dragon guppies that went into the tub which is nowhere near as fun to view had an extra female so there's 3 females with the one male so there should be plenty of babies there soon.