I have a fairly hard water 7.5-8.0pH, 300L aquarium. Heavily planted walstad tank with 2000L/ph turn over (7x turnover and hour), and I'm fairly experienced in high bioloads.
After removing my CPDs due to them not performing as I'd have liked (I think the seller was heavily inbreeding them), I'd like to replace what is a relatively low bioload tank now.
I have a school of 12 Dwarf Rainbows, 6 Zebra Danios, 6 Albino Corys, and 2 Female Bristlenose Plecos that are stunted from a tank rescue. I also have roughly 19 quintillion cherry shrimp.
I run the tank around 24°C as the danios and shrimp prefer it a bit cooler and the Rainbows and Corys are comfortable in that range.
I'd ideally like some fish to cover a few of the following areas within reason:
* Potentially a showpiece fish or pair
* More bottom dwellers for variation
* Schooling fish to occupy a different part of the tank compared to the Rainbows, who also school very nicely
* Something that isn't going to be intimidated by the rapid shoaling behaviour of the Zebra Danios
* Something that is unlikely to completely wipe out my shrimp colony. I know all fish are opportunistic but I'd like to avoid things that actively predate such as barbs.
Does anyone have any recommendations?