According to my city website
Alkalinity 91.1 mg/l
Hardness 98.2 mg/l
PH 6.85
This is soft slightly acidic water, excellent for just about any soft water fish species. Just so you know, when considering fish avoid all livebearers (guppy, Endler, molly, platy, swordtail) as these must have harder water. Most fish from South America, SE Asia will be soft water.
mg/l is the same as ppm, so 98 ppm equates to 5 dGH; these two units are used in the hobby so it is nice to know the equivalent.
As for the gravel the bag just says, TopFin Aquarium Gravel Colour listed is bright white. No other information is provided on the bag, I didn't realize the gravel could change my levels.
The TopFin website has this:
Note: Gravel may contain minerals that affect water pH. Monitor your water pH after adding gravel and adjust as necessary to avoid sudden pH changes.
As your tank water tests indicate the pH is much higher than the tap water, and the GH and KH are a bit higher, ity might be that this gravel is calcareous. Calcareous means the gravel is composed of a rock that contains calcium and magnesium (either or both, calcium is the most common) and this is something you should avoid with softy water fish as it can create issues over time. Cories have also been mentioned, and they need sand. And the bright white is an issue for fish.
At this juncture, you might want to consider replacing the gravel. I use regular play sand which is very inexpensive, realistic, fish and plants do well...there really is no detriment to darker sand. Your call, but in my view you will be happier with a darker sand after the fish are in, and now is the time to change this.
oyo Loaches, But I have not been able to find a healthy supply. Pet Smart (being the only Aquatics store in my area) seems to only carry very small babies and after my second failed attempt at adding Yoyos I contacted the chain and they advised me that the most recent supplies have all been sickly and very small and there has been an increase in returns I'm guessing due to sick babies.. I'm heartbroken, to be honest, I love how they look and act but for now it just doesn't seem to be an option for me.
This tank is too small for a group of YoYo Loaches. As I mentioned previously, loaches are shoaling fish and must have a group of five (or more, depending upon tank space). This species grows to six inches which means a 4-foot length tank minimum.