Congo tetras will nibble on plants, but not as bad as pleco's from my experience. You'll need to be ok with the sword especially getting chomped on. While not as large or rainbow colored as Congo's I'm building up a school of Emporer Tetras in my 75 high tech and they are gorgeous.. same shape as Congo's with males getting the fin extensions, but they don't eat plants and if the tank is densely planted enough you may have an occasional fry make it to adulthood. You know it's not what people make it out to be in going high tech especially in a big tank... 2 Beamswork FSPEC fixtures... a $100 Aquatech regulator, a filled 20# C02 tank, a self built reactor plumbed into the canister, and some timers... it is so worth it... the growth is 1000000 times better and you'll see plants growing and a diverse ecosystem developing instead of struggling with algae, dying plants, and all the other stuff. It takes a little more in initial setup, but other than that it's actually easier... alot less tinkering and ALOT less money spent on plants as you actually grow plant mass at reasonable rate. It would also take the sting out of the plant nibblers... I have C02 on every one of my tanks.. even my 150 African Hap and Peacock tank. It's makes them so much more lush and enjoyable. A 20lb tank would last more than a year. Ive got a 10lb tank for my 150 and I figure it will last 8-9 months.
As far as stocking I think it would be much more enjoyable for you to have 1 species of Cory with a school of 20...
One species of small schooling fish with a group of 35-40
And then the Rams and perhaps 2 Pearl Gourami's. It makes for a much more cohesive enjoyable display. No one ever listens, but everyone ends up seeing it.
In my top 75 I have a pair of Apisto Caucatoides, a growing group of Emporer Tetras (11 now I think), a growing group of Oto's ( I want 8) and 2 male Rainbows of 3 species (Bosemani, Goyder River, Millenium)
Twin high tech 75's -
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Last edited by The Dude1; 09-12-2017 at 09:19 PM.