new thirty gallon tank help

[fishguy007]

hello,

i have just set up a new thirty gallon tank.

i have a 120, but i had to downsize until the new house is built.

i set up a 30 gallon when i first set it up i used crused coral on the bottom and life rock. put a few corals in but it did not last long. anyone know why?.


i am running a protein skimmer hob type and a 75 hob filter and a power head

this time i changed 20 percent water and took out crused coral and using sand. and only a few pieces of live rock

how many fish will this tank hold. i looked on you tube and some ppl have like 15 fish in a tank this size including a foxface etc

how many can i get in this tank safe?\

also any info on why tank did not survive the first time?