Had 2 ten gal tanks. Fully cycled. Had them for over 6 months. One had 5 red tail rasboras, 3 appleSnails, The other 3 black skirt tetra, 3 red eye tetra , 2 apple snails. Got a new 29 gal tank , so I put gravel and water in from both tanks and all fish and snails. Per rule of thumb 1 in. of...