Adding New Fish To An Established Community Tank

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pgw2000

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I have had my 40 gallon tank for a year now and have not had a fish die for about 6 months, so my environment is pretty stable. I have 12 community fish in my tank right now, and I want to add new fish, but I don't know if this would be stressful for them since they have been used to this environment for a while. Also, if I do add new fish, would it help to clean and rearrange the decor before adding the new fish or would that make the transition even more stressful?
 

Discusluv

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Hi! First of all, any fish you add would need to be quarantined first before adding to your established tank- so that you don't introduce parasites or pathogens into your tank. Visually fish at shops may appear fine, but once you get them home can then show systems- such as Ich. Do you have a quarantine tank? What fish do you have currently in your tank? What fish are you thinking of purchasing?
 
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pgw2000

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Yes, I have a quarantine tank. I currently have 5 tetras, 4 platys, a golden severum, a rainbowfish, and a gourami. I wanted to add a larger batch of fish, probably 10 or so, of small-medium size, but I dont know what kinds.
 

Discusluv

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Great! If these fish all seem to be compatible, why not get more tetras, as they are a schooling fish. I really like rummy-nose tetras as they are a very hardy species.. Here is a bit about them: Rummy Nose Tetra
 
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pgw2000

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Awesome! Thanks! Would it be a good idea for me to do a "deep" cleaning as I haven't actually cleaned my substrate for a while or should I just leave it be?
 

Discusluv

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You should routinely clean your substrate with a python siphon hose, definitely.
 

MattS99

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If you want some kind of schooling fish, I'd go with a tetra for sure, as Discusluv said. If you can find them, I'd also suggest Lemon Tetras and maybe even Colombian tetras. The Colombians may get a little too big for what you're looking for, though.
 
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