I would switch out two AC110s for a quality canister filter. They probably cost about the same anyway. You'll get much better results and the tank will look cleaner this way.
I'd prefer live plants but thats up to you. The Neon Dwarf Rainbows need some heavy planting.
I would drop the 8 platies and instead double the size of your rasbora school. They are a very nice fish to watch in large schools.
You could add another BN pleco.
You could add a few more rainbows as well... 75g is a lot of space to work with and most of the fish you've listed max out at 2-3" and don't contribute significant bioloads.
Glo-fish are really zebra danios and therefore not a schooling fish. If you add them to the tank they'll just zip around. Its a very disorganized look but it gives nice contrast to the schooling fish like the HR. I keep danios with my Hr and I have to say the school versus the random sprinting is a good mix.
Stocking a 75 gal
Okay - I agree about the Rasboras - I added 6 more. I also added 2 more Neon Rainbows. Sorry, I love Platies and I think they need to stay.
Re the BN Cat - can you have 2?
As this is my first tank, I want to stick to artificial decor. Can always switch to live plants when I have more experience.
Also, saw on another post about inline heaters for canister filters. I might like to go that route.
1 Eheim 2215
1 AC 110
Artificial plants, rock & wood decor, black background
1 piece Natural driftwood (for BN Cat)
Estes Marine Sand substrate - Black
20 Harlequin Rasbora (a must for my tank)
12 Skunk Cories (also a must)
1 BN Catfish (also a must)
8 Male Platies
10 Neon Dwarf Rainbowfish
I think I am getting close to a final list. Really like the fish on this list.
75 gal - Smudge Spot Cories, Silvertip & Pristella Tetras, Scissortail & Red Tail Rasboras, Zebra Danio, Wild Caught BNP
Dual 29 gals - Diamond Tetras. Harlequin Rasboras, Bloodfin Tetras, Peacock Gudgeon
10 Gal - Mr. Betta's Fishy Paradise
"Life isn't about waiting for the storm to pass....it's about learning to dance in the rain"
In a tank that size I'm sure you could have 2. They breed pretty easily if they're happy, so you may end up with extra tank occupants if you get a male and female. People in my area are ALWAYS selling BNs which are trying to repopulate the tank.
I would probably leave the stocking at what you have and not get any more species. You have done your research well and it's great to see you're planning on decent school sizes! You will love the Harleys, they're my favourite schooling fish.