One of the shrimp tanks is a very happy tank. What arrived from ??? has now turned into a really thick mat. Yesterday I was cleaning up the tank this mat is almost covering the top of the tank~~~~ It is thick clean but what should I do??? It is blocking the light and full of baby shrimp. It s 4G Finnex with all the toys. It stays together. Literally 3/4 of this tank top is a mat of ricca.