So, say my shrimp are soo randy they breed worse than tiny ramshorn snails. A 15 gallon tank has at least 3 batches of young from age in days to weeks, with more eggs visible on the female adults. I had 6 adults ~3 months ago and I probably have in excess of 50 shrimp in the tank now - a tad overkill. I am debating catching as many as I can (difficult with fixed decor and delicate plants) then possibly culling the rest with a copper based med? Providing I buy sensibly next time and choose shrimp that won't breed in freshwater I negate the chances of this happening again. It is getting a wee bit silly now, my substrate is crawling with the darn things and it is not pleasant!