Too Much Bioload?

[FishyWater2525]

Hi!

Next weekend, my local Petco is having their first major aquatics event, and all freshwater fish and live plants are 50% off!!!! I'm soooooo excited!
Back to my question......

I had some fish I was wanting to purchase, but how many fish is the limit?
Here is the list I plan to go from:

20gH

Current Inhabitants
1- Molly
3- Black Skirt Tetras

What I Plan To Add
3- Black Skirt Tetras
7- Harlequin Rasboras

Is this too much to add at one time, or will it be ok?

10g

Current Inhabitants
6- WCMM
2- Amano Shrimp

What I Plan To Add
2- WCMM
5- Ghost Shrimp

Again, is this too much to add at one time, or is it ok?

Sorry for the long post, and thanks for reading!! Help appreciated!! Thanks!!

[Fishguy1111]

For the 20, thats fine, atleast IMO. For the ten, that may be a little overboard, but manageable. I may be wrong, though.

[MojoDaRott]

The ghost shrimp wont live long and dont reproduce in freshwater. But still small Bio load. I get them cheap like 10 for a dollar every couple months just to see something new. But they usually die within a month or my fish get a hold of them.

What do fish say when they hit a wall? ...... Dam!

[Bichir Bro]

The 20 is already pretty close to being fully stocked with the Molly IMO. They get up to 5" and need some salt. They're also none stop pooping machines, I mean they can hang with plecos in the, "all I do is poop and eat" club. I suggest removing him and then you can add those fish you want without any worries!

[ScotJudd]

I agree about the Molly but I work on a basic rule of thumb to NOT increase my stock by more than 20% at a time. I think more than doubling your stock in one go is asking for trouble. Your bio load will increase too high before your BB can respond and you risk a mini cycle. Certainly monitor ammonia like a hawk if you go ahead and WC as required until filters catch up.
Happy shopping though. Steve.