OK, so at the moment, I have two 10 gallon tanks, but will soon be adding a 29 gallon tank.
I have a pictus catfish, golden gourami, and 3 zebra danio in one 10 gallon. The other 10 gallon has 2 cory cats, 4 GloFish, and 2 wags. Only 2 or 3 of the fish in the second tank have reached 1 inch in size.
Anyways, the pictus cat is getting close to 4 or 5 inches and doesnt seem to have much room in the 10 gallon. I have heard these are very active fish and I am thinking the 10 gallon is too cramped for him. He usually just hides behind a rock and comes out to eat.
My plan was to buy a 29 gallon and transfer the gourami and pictus cat to the 29 gallon, while transferring the 3 zebras to the 10 gallon. The question I have is this: I don't have much room in my room to keep 3 tanks going at the same time. I know you need atleast 6 weeks to mature a tank and I have heard that it's not good to add a scaleless fish (pictus cat) to an immature tank. I also have a 55 gallon in my living room, which has been mature for about 20 years haha. Is there any way I can move the gravel from the 10 gallon (whiile also adding more new gravel) and the water from the 10 gallon and some water from the 55 gallon? Would this make the 29 gallon matur enough to immediately add the pictus, or would it need more time?