Join Date: Nov 2018
Location: Oil City PA. USA
I think Panda Cory will be fine with the Betta since they are a bottom dweller. In a 30 gallon tank you would have plenty of room to house them. A shoal of Cory is recommended. ( 6-10) makes up a shoal. Make sure the substrate is either sand, or small pebbles. The finer the substrate the easier it is for the Cory to find food. Cory find food with their whiskers, so the finer the substrate the easier it is for them to feel their way around for food.
Make sure the tank has cycled and matured enough that once the shoal is in they will be able to find food. A mature tank is one that has cycled and is up and running for at least one month after the cycle has ended.
When adding the shoal know that there will be a tremendous amount of ammonia created. you will need to test Daily and water changes of 25 -50 % every other day, depending on the water parameters, and ammonia readings) Until the filter, and beneficial bacteria has been able to breakdown, and clear the ammonia, and nitrite and nitrates. This would also be for any other fish you would add to the tank later.
Another recommendation, and this is my recommendation is to make sure you over filter the tank. Meaning the filter should be one that will filter at least 5 x the amount of water the tank holds per hour. The filters that are recommended for a 30 gal. tank would be just enough to filter a tank that doesn't have a shoal along with live plants. But you may think about a good canister filter for that size of a tank. up until last Sat. the filter I had on the 29 gal. was a Marineland c250. along with a HOB Tetra 70. This made sure the tank was filtered from the bottom to top. I had 20 x the amount of filtration and this tank (like all of my community tanks) was over crowded. ( this overcrowding was done on purpose with a heavily planted tank for lots of cover both top and bottom, and mid in the tank.)
Also with Cory, make sure they have enough plants and rock/driftwood to hide in and around. They are a shy fish and like to know they are safe. (heavily planted is if you see your betta or Cory at a glance you DON'T have enough plants and places to hide. )