Going Forward With The Tank Upgrade!

[Brahmza]

Hey everyone. Currently, I have a 55G tank stocked with 8 juvenile super red severums, 4 mid-sized blue acara, 6 Dekai Village Rainbows, 5 Red Head Tapajos and 1 Mango Pleco. No one freak out, they're all still young (nothing over 2.5" other than one 4" male acara). In a few weeks I am upgrading to a 125G tank (72"x18x21). I am going to be keeping one pair of the severums and one pair of the acara, so my stocking will be as follows:

2 Super Red Severums
2 Blue Acara
6 Dekai Village Rainbows
5 Red Headed Tapajos
2 Synodontis Cats
1 Mango Pleco
 
My question is, with the stocking list above, would I be able to add in any fish? Or would the tank be pretty much at capacity? 55G is the largest tank I've had, so I'm slightly inexperienced when it comes to stocking such a large tank. Any help/info would be appreciated!
(If I were able to add fish, I would look at possibly 3 Blue Gouramis, or some other fish to add some 'cool' colors.[blue/green])

 

[ShinySideUp]

I just looked up all the fish on your list and with the possible exception of the Mango pleco (and that's not small), they seem to be very large fish at full stretch. If it were me I would get my tank, put the above fish in and then wait and see how things go before adding anything. My own tank is a 640 litre (140 UK gallons), six footer but it is mostly for the Clown loaches who have yet to grow into it. There are many other fish in there but they are all pretty small so that I have an active tank but with nothing too big (apart from the loaches, when they get there).

 

[RRaquariums]

Yeah it sounds like a good male betta set up to me
Sorry wrong thread lol

 

[Brahmza]

Well, the size of the fish is as follows - -

Severums: 10" Current size - 3"
Blue Acara: 6" Current size - 4"
Geo Red Heads: 5" Current size 2"
Dekai Rainbows: 4" Current size 2-3"
Synodontis Cats: 3" Current size 1.5"
Mango Pleco: 11" Current size 5"
 
Going by the old rule of 1" of fish per gallon puts me around 80" or so, though I know that is a rule that shouldn't be followed. I guess my real question is, with these species, would there be any aggression between the fish if I decided to add in 3 Blue Gouramis? I will have enough filtration to handle the bioload of the tank. I know the fish listed above are all generally peaceful.