Well,in 75 gallon's six tiger barb's are not likely to create much in the way of measureable ammonia due to the larger volume of water.
If this were a 20 gal tank,then there would most likely be more measureable ammonia.
Were it me,(and it ain't) I would continue with the six tiger barb's and feed sparingly for another week or two and then add another three or four small fish,another couple week's, and add a few more .
Is slow way to build bacterial colony, and not cause harm to fishes.
If you know someone with established aquarium and could borrow portion of their filter media and or a cup of substrtae,,this too would help produce bacterial colony a bit quicker.
A couple handful's of floating water sprite would also be of help in taking up ammonia and or fast growing stem plant's depending on goal's for your tank(ie) planted or fish only.
If this were a 20 gal tank,then there would most likely be more measureable ammonia.
Were it me,(and it ain't) I would continue with the six tiger barb's and feed sparingly for another week or two and then add another three or four small fish,another couple week's, and add a few more .
Is slow way to build bacterial colony, and not cause harm to fishes.
If you know someone with established aquarium and could borrow portion of their filter media and or a cup of substrtae,,this too would help produce bacterial colony a bit quicker.
A couple handful's of floating water sprite would also be of help in taking up ammonia and or fast growing stem plant's depending on goal's for your tank(ie) planted or fish only.
