its my 10 gallon ive had it about 4 monts or so its been cycled had a few fish deaths but apart from that ive had no problems with it but now its gone a browny unclear colour it went like that about a day ago i put some new fish in 2 leopard corys and also put some rocks in the rocks were alreadly in my 25 gallon but i moved them in the 10 i did a water change but no difference i dont want to do to many water changes because it will stess my new fish out i cleaned the filter sponge but when i put it back in the bottom was off could this have done it? i notied the bottom of the filter on the gravel about 3 hours after i put it back in so i turned it off and put it back on what should i do? more changes and wait?