Hi! I’m new to this forum. I recently started a 29 gallon tank with 5 ****** loaches (one of the five I’ve had for a little over a year and was transferred into the new tank) and 6 black phantom tetras. I just found the smallest of the loaches dead in the gravel. It appears as if he tried to dig down into the gravel but got stuck. I know that loaches like to dig but I read that as long as they have plenty of hiding spots (which I’ve provided plenty) they will be fine with a gravel substrate. Now I’m worried that the gravel is going to be dangerous to have. I want to make sure these little guys are healthy. Should I change over to a sand substrate or maybe just incorporate some sand? I’m worried about doing a complete change of substrate since the tank has only been cycling for about three weeks and I don’t want to stress the fish out! Help! 😞