I have 10 lambchop Rasboras with 7 sparkling gouramis. Whenever I feed them the Rasboras decimate the pellet food in seconds! The food floats on top and doesn’t even get a chance to sink yet. The gouramis are usually kinda clueless to the food until it’s too late. So I noticed the gouramis don’t really get any. How can I alleviate this situation?