Planted Tank Guru
Join Date: Dec 2012
Location: Hot Springs Ar. 71901
Soundsto me like you have about a 15-25% stocking level now depending on the size of the Angel fish. Hardy was stated by whom...because they are more delicate about ammonia than any fish I know of. Where other things are concerned it may be at least partially true, but not about ammonia. Adding that many at one time/w a fairly low bio-load will cause an ammonia spike because at the best there are few of the beneficial bacteria present. These bacteria colonize as per food available.
On the other hand Bio-Spira is a good bacteria product and they sold the pattent rights to Tetra for the freshwater version...Tetra Safe Start.
If I used one of the large bottles of that when I put these neon's in there I might chance 50 of them. Don't know if you are considering your plants as an ammonia removal source or just a place where they normally colonate, but remember the bacteria only colonize as per the availale food supply regardless of how much surface aria they have to work/w.
The shortest distance between any two points is a straight line...in the opposite direction...