Thin Strings What is it?

Lisa Cain · Oct 21, 2018

Two weeks ago I transferred everything from m 32 gallon biocube to my new 90 gallon aquarium. I siphoned the sand, filer material and changed 30-40% of the water. The sand was very dirty and although I cleaned a lot the siphon broke so a lot of the debri remained. My sand after a day turned golden brown. My ammonium and nitrates were zero. Yesterday I put in 1 saddle back puffer and a diamond goby. Giving the tank to my 16 year old. The water as crystal clear (purigen, and chemipure elite are in the filter) and water parameters were excellent until I put in three new pieces of live rock and the two fish. The goby has been sifting the sand like crazy and making holes. Both fish seem fine but the goby is making the water inhabited with sand particles and these strings are developing and are hanging from the walls of the aquarium and rocks. See pictures below. This morning there were only a few from yesterday and the water was clear but as soon as the goby came out and sifted the sand about 3 hours later thin strings were everywhere. Please identify the strings? Should I move the puffer to o the 90 gallon tank? I brought him for my son and I do not want him to die.